docs(Contributing): Update contributing.md to include testing with the example

Author: Gertjan Reynaert

contributing.md

@@ -13,7 +13,17 @@ Here are the steps required for contributing:
 5. Make sure eslint errors are fixed, if eslint errors don't show up in your editor you can always check them with
   > npm run eslint
 
-6. Commit your changes according to the conventional changelog commit convention we use
-7. Create a pull request
+6. Check if everything works well by using the example application
+  1. Create a build for the translation manager
+    > npm run build
+  2. Create a build for the example application
+    > cd example
+
+    > npm run build
+  3. Run the translation manager
+    > npm run manage:translations
+
+7. Commit your changes according to the conventional changelog commit convention we use
+8. Create a pull request
 
 (If you encounter additional steps during your contribution, do not hesitate to update this document)