Aliases: Adding a README file for the plugin. #4662

plugins/aliases/README.md

+## Aliases Cheatsheet
+
+**Maintainer:** [@hqingyi](https://github.com/hqingyi)
+
+With lots of 3rd-party amazing aliases installed, this plugin helps list the shortcuts
+that are currently available based on the plugins you have enabled.
+
+Enable this plugin by adding it to your `plugins` definition in `~/.zshrc`.
+
+  ```
+  plugins=(aliases)
+  ```
+
+Requirements: Python needs to be installed.
+
+### Usage
+
+```
+  acs: group all alias
+  acs $keywordquickly filter alias & highlight
+```