💡 add plugin docstring

docs_build/README.rst

@@ -4,6 +4,7 @@ NoneBot Api Reference
 :模块索引:
   - `nonebot <nonebot.html>`_
   - `nonebot.config <config.html>`_
+  - `nonebot.plugin <plugin.html>`_
   - `nonebot.matcher <matcher.html>`_
   - `nonebot.rule <rule.html>`_
   - `nonebot.permission <permission.html>`_

docs_build/plugin.rst

@@ -0,0 +1,12 @@
+---
+contentSidebar: true
+sidebarDepth: 0
+---
+
+NoneBot.plugin 模块
+====================
+
+.. automodule:: nonebot.plugin
+   :members:
+   :show-inheritance:
+   :special-members: __init__