INT-1477 added readme files and description in each category as well as the root folder

advanced/readme.txt

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+
+									$$ ADVANCED Samples $$
+
+This category targets advanced develoopers who are well familiar with Spring Integration framework but looking to 
+extend it to address a specific custom need by extending from Spring Integration public API. 
+For example; if you are looking for samples showing you how to implement a custom Channel or 
+Consumer (event-based or polling-based), or you trying to figure out what is the most appropriate way to implement 
+custom BeanParser on top of Spring Integration<6F>BeanParser<65>hierarchy when implementing custom name space, 
+this would be the right place to look.
+Here you can also find samples that will help you with adapter development. Spring Integration comes with an extensive 
+library of adapters that allow you to connect remote systems with Spring Integration messaging framework. 
+However you might have a need to integrate with system for which the core framework does not provide an adapter. 
+So you have to implement your own. This category would include samples showing you how to implement various adapters.

applications/readme.txt

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+
+								$$ APPLICATIONS Samples $$
+
+This category targets developers and architects who have a good understanding of the Messaging architecture, 
+EIP and above average understanding of Spring and Spring integration and are looking for samples that 
+address a particular business problem. In other word the emphasis of samples in this category is 'business use cases' 
+and how it could be solved via Messaging architecture and Spring Integration in particular. 
+For example; If you are interested to see how a Loan Broker process or Travel Agent process could be implemented and 
+automated via Spring Integration this would be the right place to find these types of samples.

basic/readme.txt

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+
+								$$ BASIC Samples $$
+
+This is a good place to get started. The samples here are technically motivated and demonstrate 
+the bare minimum with regard to configuration and code to help you to get introduced to the basic 
+concepts, API and configuration of Spring Integration and how they relate to Enterprise Integration Patterns (EIP). 
+
+For example; if your are looking for an answer on how to wire service-activator to a channel or how to 
+apply Gateway to your message exchange or how to get started with using MAIL or XML module etc., 
+this would be the right place to find a good sample. This category of samples is this is a good place to start.

intermediate/readme.txt

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+
+								$$ INTERMEDIATE Samples $$
+
+This category targets developers who are already familiar with Spring Integration framework (past getting started), 
+but need some more guidance while resolving <20>more advanced technical problems that you have to deal with 
+once switch to a Messaging architecture. 
+For example; If you are looking for an answer on how to handle errors in various 
+scenarios or how to properly configure Aggregator for the situations where some messages might not ever arrive 
+for aggregation etc,. and any other issue that goes beyond a basic understanding and configuration of a 
+particular component and addresses "what else you can do with it" type of problem this would be the right place 
+to find these type of samples.

readme.txt

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+                    ===============================================================
+					$$$			Welcome to Spring Integration Samples			$$$
+					===============================================================
+					
+To simplify your experience, Spring Integration Samples were split in 4 distinct categories.  
+Inside of each category you'll find 'readme.txt' which will contain a more detailed description 
+of that category specifics. Each sample also comes with its own 'readme.txt' file explaining details.
+
+Below is a short description of each category.
+
+BASIC
+   	This is a good place to get started. The samples here are technically motivated and demonstrate the bare 
+   	minimum with regard to configuration and code to help you to get introduced to the basic concepts, API and 
+   	configuration of Spring Integration. For example if your are looking for an answer on how to wire service-activator 
+   	to a channel or how to apply Gateway to your message exchange or how to get started with using MAIL or XML module etc., 
+   	this would be the right place to find a good sample. The bottom line is this is a good place to get started.
+
+INTERMEDIATE
+	This category targets developers who are already familiar with Spring Integration framework (past getting started), 
+	but need some more guidance while resolving <20>more advanced technical problems that you have to deal with 
+	once switch to a Messaging architecture. 
+	For example; If you are looking for an answer on how to handle errors in various 
+	scenarios or how to properly configure Aggregator for the situations where some messages might not ever arrive 
+	for aggregation etc,. and any other issue that goes beyond a basic understanding and configuration of a 
+	particular component and addresses "what else you can do with it" type of problem this would be the right place 
+	to find these type of samples.
+
+ADVANCED
+	This category targets advanced develoopers who are well familiar with Spring Integration framework but looking to 
+	extend it to address a specific custom need by extending from Spring Integration public API. 
+	For example; if you are looking for samples showing you how to implement a custom Channel or 
+	Consumer (event-based or polling-based), or you trying to figure out what is the most appropriate way to implement 
+	custom BeanParser on top of Spring Integration<6F>BeanParser<65>hierarchy when implementing custom name space, 
+	this would be the right place to look.
+	Here you can also find samples that will help you with adapter development. Spring Integration comes with an extensive 
+	library of adapters that allow you to connect remote systems with Spring Integration messaging framework. 
+	However you might have a need to integrate with system for which the core framework does not provide an adapter. 
+	So you have to implement your own. This category would include samples showing you how to implement various adapters.
+
+APPLICATIONS
+	This category targets developers and architects who have a good understanding of the Messaging architecture, 
+	EIP and above average understanding of Spring and Spring integration and are looking for samples that 
+	address a particular business problem. In other word the emphasis of samples in this category is 'business use cases' 
+	and how it could be solved via Messaging architecture and Spring Integration in particular. 
+	For example; If you are interested to see how a Loan Broker process or Travel Agent process could be implemented and 
+	automated via Spring Integration this would be the right place to find these types of samples.
+	
+										$$ Happy Integration! $$
+