docs: add homebrew install snippet to readme (#208)

Author: cmoog

README.md

@@ -1,4 +1,4 @@
-# coder-cli
+# Coder CLI
 
 [![GitHub Release](https://img.shields.io/github/v/release/cdr/coder-cli?color=6b9ded&include_prerelease=false)](https://github.com/cdr/coder-cli/releases)
 [![Documentation](https://godoc.org/cdr.dev/coder-cli?status.svg)](https://pkg.go.dev/cdr.dev/coder-cli/coder-sdk)
@@ -9,20 +9,23 @@
 
 To report bugs and request features, please [open an issue](https://github.com/cdr/coder-cli/issues/new).
 
-## Usage
+## Installation
 
-View the `coder-cli` documentation [here](./docs/coder.md).
+### Homebrew (Mac, Linux)
 
-You can find additional Coder Enterprise usage documentation on [https://enterprise.coder.com](https://enterprise.coder.com/docs/getting-started).
+```sh
+brew install cdr/coder/coder-cli
+```
 
-## Install Release
+### Download (Windows, Linux, Mac)
 
 Download the latest [release](https://github.com/cdr/coder-cli/releases):
 
 1. Click a release and download the tar file for your operating system (ex: coder-cli-linux-amd64.tar.gz)
-2. Extract the `coder` binary from the tar file, ex:
+2. Extract the `coder` binary.
 
-```bash
-cd ~/go/bin
-tar -xvf ~/Downloads/coder-cli-linux-amd64.tar.gz
-```
+## Usage
+
+View the usage documentation [here](./docs/coder.md).
+
+You can find additional Coder usage documentation on [coder.com/docs/cli](https://coder.com/docs/cli).