add persistence layer section in the docs

Author: kpicaza

docs/framework/_sidebar.md

@@ -4,6 +4,7 @@
     * [Running Application](/framework/running-application.md "Running guide for Antidot Framework")
     * [Routing](/framework/routing.md)
     * [Templating](/framework/templating.md)
+    * [Persistence Layer](/framework/persitence.md)
     * [Dependency Injection](/framework/dependency-injection.md)
     * [Logger](/framework/logger.md)
     * [Event System](/framework/event-system.md)

docs/framework/persitence.md

@@ -0,0 +1,20 @@
+# Persistence Layer
+
+Antidot Framework doesn't have any persistence layer defined, it left the decision o where and how you want to store and consume your data.
+Anyway, we provide some adapters to use out of the box for the most popular persistence libraries.
+
+## Doctrine DBAL Adapter
+
+Uses Doctrine DBAL abstraction layer for database connections.
+
+> [Doctrine DBAL Adapter](https://github.com/antidot-framework/dbal-adapter)
+
+Coming soon
+
+## Doctrine ORM Adapter
+
+Uses Doctrine ORM complete stack.
+
+> [Doctrine DBAL Adapter](https://github.com/antidot-framework/doctrine)
+
+Coming soon