docs(README) add readme

Author: danarth

README.md

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+# azure-cli.zsh ![GitHub release](https://img.shields.io/github/release/danarth/azure-cli.zsh.svg)
+
+Oh My Zsh plugin providing auto-completion for [Azure CLI](https://learn.microsoft.com/en-us/cli/azure/)
+
+## Usage
+
+### [antigen](https://github.com/zsh-users/antigen)
+
+Add antigen bundle danarth/azure-cli.zsh to your ~/.zshrc
+
+### [oh-my-zsh](https://github.com/oh-my-zsh/oh-my-zsh)
+
+Clone the repository inside your oh-my-zsh repo:
+
+```
+git clone https://github.com/danarth/azure-cli.zsh ${ZSH_CUSTOM:-${ZSH:-~/.oh-my-zsh}/custom}/plugins/azure-cli
+```
+
+Then add it to your oh-my-zsh plugins:
+
+```
+plugins=(... azure-cli)
+```
+
+## Caveats
+
+So far, this plugin has only been tested on:
+
+* Ubuntu 18.04
+* MacOS with azure-cli installed through homebrew
+
+Feel free to add support for other platforms