Add additional information to README

Author: eleftherias

CONTRIBUTING.adoc

@@ -6,7 +6,7 @@ something, or simply want to hack on the code this document should help you get
 
 == Code of Conduct
 
-Please see our https://github.com/spring-projects/.github/blob/master/CODE_OF_CONDUCT.md[code of conduct]
+Please see our https://github.com/spring-projects/.github/blob/master/CODE_OF_CONDUCT.md[code of conduct].
 
 
 == Reporting Security Vulnerabilities
@@ -26,7 +26,6 @@ information as possible. Ideally, that would include a small sample project that
 reproduces the problem.
 
 
-
 == Sign the Contributor License Agreement
 If you have not previously done so, please fill out and
 submit the https://cla.pivotal.io/sign/spring[Contributor License Agreement].

README.adoc

@@ -13,27 +13,61 @@ It also provides transparent integration with:
 
 == Modules
 
-Spring Session consists of the following modules:
+This Spring Session repository consists of the following modules:
 
 * Spring Session Core - provides core Spring Session functionalities and APIs
 * Spring Session Data Redis - provides `SessionRepository` and `ReactiveSessionRepository` implementation backed by Redis and configuration support
 * Spring Session JDBC - provides `SessionRepository` implementation backed by a relational database and configuration support
 * Spring Session Hazelcast - provides `SessionRepository` implementation backed by Hazelcast and configuration support
 
+Additional Spring Session modules can be found in the https://github.com/spring-projects/spring-session-data-mongodb[spring-session-data-mongodb] repository
+and [https://github.com/spring-projects/spring-session-data-geode]spring-session-data-geode repository.
 
-== Code of Conduct
+== Getting Started
+
+We recommend you visit the https://docs.spring.io/spring-session/docs/current/reference/html5/#samples[Spring Session Reference] and look through the "Samples and Guides" section to see which one best suits your needs.
+
+== Samples
+
+Spring Session samples are available in the https://github.com/spring-projects/spring-session/tree/master/spring-session-samples[spring-session-samples] directory.
+
+
+== Contributing
 
-Please see our https://github.com/spring-projects/.github/blob/master/CODE_OF_CONDUCT.md[code of conduct]
+Please see our https://github.com/spring-projects/spring-session/blob/master/CONTRIBUTING.adoc[Contributing guidelines]
+for information on how to report issues, enhancements or security vulnerabilities.
 
+== Building from Source
 
-== Reporting Security Vulnerabilities
+Spring Session uses a https://gradle.org[Gradle]-based build system.
+In the instructions below, `./gradlew` is invoked from the root of the source tree and serves as
+a cross-platform, self-contained bootstrap mechanism for the build.
 
-Please see our https://github.com/spring-projects/spring-session/security/policy[Security policy].
+Check out sources
+----
+git clone [email protected]:spring-projects/spring-session.git
+----
 
+Install all spring-\* jars into your local Maven cache
+----
+./gradlew install
+----
 
-== Spring Session Project Site
+Compile and test; build all jars, distribution zips, and docs
+----
+./gradlew build
+----
+
+
+== Documentation
+
+You can find the documentation, samples, and guides for using Spring Session on the https://projects.spring.io/spring-session/[Spring Session project site].
+
+For more in depth information, visit the https://docs.spring.io/spring-session/docs/current/reference/html5/[Spring Session Reference].
+
+== Code of Conduct
 
-You can find the documentation, issue management, support, samples, and guides for using Spring Session at https://projects.spring.io/spring-session/
+Please see our https://github.com/spring-projects/.github/blob/master/CODE_OF_CONDUCT.md[code of conduct].
 
 == License