Add shell path info

Author: Stichoza

README.md

@@ -23,6 +23,8 @@ composer global require stichoza/laravel-coderunner
 laravel-coderunner $filename
 ```
 
+**Note:** If you don't have composer path added in your `.profile` or `.bash_profile`, go to CodeRunner preferences, navigate to Advanced tab and add `/Users/YOUR_USERNAME/.composer/vendor/bin` to `PATH` shell variable. 
+
 ### Running code for specific project
 By default, the code is evaluated in default Laravel installation that is provided with this package. Follow this steps if you want to run code in different project: