Add Getting Started and Update Nav

Issue gh-2301

spring-session-docs/modules/ROOT/nav.adoc

@@ -1,4 +1,10 @@
 * xref:whats-new.adoc[What's New]
+* xref:getting-started.adoc[Getting Started]
+** xref:getting-started/using-redis.adoc[Using Redis]
+** xref:getting-started/using-jdbc.adoc[Using JDBC]
+** xref:getting-started/using-mongodb.adoc[Using MongoDB]
+** xref:getting-started/using-hazelcast.adoc[Using Hazelcast]
+** xref:getting-started/using-custom-implementation.adoc[Using Your Own Implementation]
 * xref:samples.adoc[Samples & Guides (Start Here)]
 ** Boot Samples
 *** HttpSession

spring-session-docs/modules/ROOT/pages/getting-started.adoc

@@ -0,0 +1,22 @@
+[[getting-started]]
+= Getting Started
+
+In order to get started using Spring Session, you must choose a persistent store to use.
+Spring Session supports a few different persistent stores out-of-the-box:
+
+- https://redis.io/[Redis]
+- https://pt.wikipedia.org/wiki/JDBC[JDBC]
+- https://hazelcast.com/[Hazelcast]
+- https://www.mongodb.com/[MongoDB]
+
+There are other projects that are not supported by Spring Session, but are supported by the community:
+
+- https://github.com/spring-projects/spring-session-data-geode[Spring Session Data Geode]
+
+Now that you have chosen the persistence store that best fit your needs, you can jump to their respective sections:
+
+- xref:getting-started/using-redis.adoc[I want to use Redis]
+- xref:getting-started/using-jdbc.adoc[I want to use JDBC]
+- xref:getting-started/using-hazelcast.adoc[I want to use Hazelcast]
+- xref:getting-started/using-mongodb.adoc[I want to use MongoDB]
+- xref:getting-started/using-custom-implementation.adoc[I want to use my own implementation]