Update README

Author: simonwhitaker

README.md

@@ -6,20 +6,32 @@ Play snake in your shell!
 
 # To play
 
-## Run from source
-
-Clone this repo, then:
+## Install with Homebrew
 
 ```sh
-go run .
+brew install simonwhitaker/tap/shellsnake
 ```
 
-## Install the binary
+## Install the binary using the Go toolchain
+
+If you have the Go toolchain installed, you can:
 
 ```sh
 go install github.com/simonwhitaker/shellsnake@latest
 ```
 
+## Download a release
+
+Check the [releases page](https://github.com/simonwhitaker/shellsnake/releases). Download, open the gz/zip file, and run `shellsnake`.
+
+## Run from source
+
+Clone this repo, then:
+
+```sh
+go run .
+```
+
 Then (assuming `$(go env GOPATH)/bin` is in your path):
 
 ```sh