Slight documentation fix

Author: jonathanmaron

CONTRIBUTING.md

@@ -14,4 +14,10 @@ git clone git@github.com:TextControl/txtextcontrol-reportingcloud-php.git .
 composer update
 
 composer dump-autoload --optimize
+```
+
+## Tag and release version
+
+```bash
+git tag release-1.0.x && git push origin --tags
 ```