Added sagan pages; fixes gh-3521

docs/src/main/asciidoc/sagan-index.adoc

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+Spring Cloud Netflix provides Netflix OSS integrations for Spring Boot apps through autoconfiguration and binding to the Spring Environment and other Spring programming model idioms. With a few simple annotations you can quickly enable and configure the common patterns inside your application and build large distributed systems with battle-tested Netflix components. The patterns provided include Service Discovery (Eureka), Circuit Breaker (Hystrix), Intelligent Routing (Zuul) and Client Side Load Balancing (Ribbon)..
+
+## Features
+
+Spring Cloud Netflix features:
+
+* Service Discovery: Eureka instances can be registered and clients can discover the instances using Spring-managed beans
+* Service Discovery: an embedded Eureka server can be created with declarative Java configuration
+* Circuit Breaker: Hystrix clients can be built with a simple annotation-driven method decorator
+* Circuit Breaker: embedded Hystrix dashboard with declarative Java configuration
+* Declarative REST Client: Feign creates a dynamic implementation of an interface decorated with JAX-RS or Spring MVC annotations
+* Client Side Load Balancer: Ribbon
+* External Configuration: a bridge from the Spring Environment to Archaius (enables native configuration of Netflix components using Spring Boot conventions)
+* Router and Filter: automatic regsitration of Zuul filters, and a simple convention over configuration approach to reverse proxy creation
+
+## Getting Started
+
+As long as Spring Cloud Netflix and Eureka Core are on the
+classpath any Spring Boot application with `@EnableEurekaClient` will try to contact a Eureka
+server on `http://localhost:8761` (the default value of
+`eureka.client.serviceUrl.defaultZone`):
+
+```java
+@SpringBootApplication
+@EnableEurekaClient
+@RestController
+public class Application {
+
+  @RequestMapping("/")
+  public String home() {
+    return "Hello World";
+  }
+
+  public static void main(String[] args) {
+    SpringApplication.run(Application.class, args);
+  }
+
+}
+```
+
+To run your own server use the `spring-cloud-starter-netflix-eureka-server` dependency and `@EnableEurekaServer`.