Add the Cowboy Function Reference

The manual details every stable public functions of Cowboy.

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+The Cowboy Application
+======================
+
+Small, fast, modular HTTP server.
+
+Dependencies
+------------
+
+The `cowboy` application uses the Erlang applications `ranch`
+for listening and accepting TCP connections, and `crypto`
+for establishing Websocket connections. These dependencies must
+be loaded for the `cowboy` application to work. In an embedded
+environment this means that they need to be started with the
+`application:start/{1,2}` function before the `cowboy`
+application is started.
+
+The `cowboy` application also uses the Erlang applications
+`public_key` and `ssl` when listening for HTTPS connections.
+These are started automatically if they weren't before.
+
+Environment
+-----------
+
+The `cowboy` application does not define any application
+environment configuration parameters.