Add README

README.md

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+Spring Platform Config provides server and client-side support for
+externalized configuration in a distributed system. With the Config
+Server you have a central place to manage external properties for the
+applications in your origanization, across all environments. The
+concepts on both sides map identically to the Spring `Environment` and
+`PropertySource` abstractions, so they fit very well with Spring
+applications. As an application moves through the deployment pipeline
+from dev to test and into production you can manage the configuration
+that needs to change between those environments and be certain that
+applications have everything they need to run when they migrate.
+
+## Quick Start
+
+Start the server:
+
+```
+$ cd spring-platform-config-server
+$ mvn spring-boot:run
+```
+
+Build a client (e.g. see the test cases for the config-client) as a
+Spring Boot application that depends on spring-platform-config-client.
+When it runs it will pick up the external configuration from the
+default local config server on port 8888. To modify the startup
+behaviour change the location of the server using
+`bootstrap.properties` (like `application.properties` but for the
+bootstrap phase of an application context), e.g.
+
+```
+spring.platform.config.url: http://myconfigserver.com
+```
+
+TODO: add a sample app.