Add TOC.

Author: beauby

index.md

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+# jsonapi-rb
+
+Efficient, convenient, flexible [JSON API](http://jsonapi.org) framework for ruby.
+
+## Guides
+
+* [Introduction](guides/introduction.md)
+* [Getting started](guides/getting_started/index.md)
+  * [Producing](guides/getting_started/producing.md)
+    * [Defining serializable resources](guides/getting_started/producing.md#definition)
+    * [Rendering documents](guides/getting_started/producing.md#rendering)
+  * [Consuming](guides/getting_started/consuming.md)
+    * [Defining deserializable resources](guides/getting_started/consuming.md#definition)
+    * [Deserializing payloads](guides/getting_started/consuming.md#deserializing)
+* [Rails integration](guides/rails.md)
+* [Hanami integration](guides/hanami.md)