docs: added git proxy docs

README.md

@@ -70,6 +70,21 @@ curl -x http://windows-vpn:3128 -I http://www.google.com
 
 Add the proxy `windows-vpn:3128` in your network settings or web browser.
 
+#### Add proxy in git
+
+Steps from [here](https://gist.github.com/evantoli/f8c23a37eb3558ab8765)
+
+> **NOTE:** Add your git server IP or domain in `GIT_PRIVATE_SERVER` variable
+
+```sh
+# Add proxy by git server domain or IP
+GIT_PRIVATE_SERVER=http://domain.com
+PROXY_SERVER=http://windows-vpn:3128
+git config --global "http.$GIT_PRIVATE_SERVER.proxy" $PROXY_SERVER
+# Check global configuration
+cat ~/.gitconfig
+```
+
 ## Useful commands
 
 ```sh