docs: update README.md

README.md

@@ -9,13 +9,22 @@
 goenv is a command-line tool to manage multiple versions of Golang on your system.
 
 ## Installation
-**Download**: https://github.com/ankitcharolia/goenv/releases
+**Releases**: https://github.com/ankitcharolia/goenv/releases
+
+**LINUX**
 ```shell
 wget -O - https://github.com/ankitcharolia/goenv/releases/latest/download/goenv-linux-amd64.tar.gz | tar -xz -C ~/.go
 export PATH=$HOME/.go:$PATH >> ~/.bashrc
 source ~/.bashrc
 ```
 
+**MAC**
+```shell
+wget -O - https://github.com/ankitcharolia/goenv/releases/latest/download/goenv-darwin-amd64.tar.gz | tar -xz -C ~/.go
+export PATH=$HOME/.go:$PATH >> ~/.zshrc
+source ~/.zshrc
+```
+
 ## Usage
 goenv provides several commands to manage Golang versions on your system.
 ```shell