Add docs for qlib.rl (#1322)

* Add docs for qlib.rl

* Update docs for qlib.rl

* Add homepage introduct to RL framework

* Update index Link

* Fix Icon

* typo

* Update catelog

* Update docs for qlib.rl

* Update docs for qlib.rl

* Update figure

* Update docs for qlib.rl

* Update setup.py

* FIx setup.py

* Update docs and fix some typos

* Fix the reference to RL docs

* Update framework.svg

* Update framework.svg

* Update framework.svg

* Update docs for qlibrl.

* Update docs for qlibrl.

* Update docs for Qlibrl.

* Update docs for qlibrl.

* Update docs for qlibrl.

* Update docs for qlibrl.

* Add new framework

* Update jpg

* Update framework.svg

* Update framework.svg

* Update Qlib framework and description

* Update grammar

* Update README.md

* Update README.md

* Update docs/component/rl.rst

Co-authored-by: you-n-g <you-n-g@users.noreply.github.com>

* Update docs/component/rl.rst

Co-authored-by: you-n-g <you-n-g@users.noreply.github.com>

* Update docs for qlib.rl

* Change theme for docs.

* Update docs for qlib.rl

* Update docs for qlib.rl

* Update docs for qlib.rl

* Update docs for qlib.rl.

* Update docs for qlib.rl

* Update docs for qlib.rl

* Update docs for qlib.rl

Co-authored-by: Young <afe.young@gmail.com>
Co-authored-by: you-n-g <you-n-g@users.noreply.github.com>

docs/reference/api.rst

@@ -256,3 +256,36 @@ Serializable
 
 .. automodule:: qlib.utils.serial.Serializable
     :members:
+
+RL
+==============
+
+Base Component
+--------------
+.. automodule:: qlib.rl
+    :members:
+    :imported-members:
+
+Strategy
+--------
+.. automodule:: qlib.rl.strategy
+    :members:
+    :imported-members:
+
+Trainer
+-------
+.. automodule:: qlib.rl.trainer
+    :members:
+    :imported-members:
+
+Order Execution
+---------------
+.. automodule:: qlib.rl.order_execution
+    :members:
+    :imported-members:
+
+Utils
+---------------
+.. automodule:: qlib.rl.utils
+    :members:
+    :imported-members: