Add script to package.json for eslint + take ts files into account with new baseline

docs/source/development/es-lint.rst

@@ -7,8 +7,12 @@ Commands
 --------
 
 To run ESLint, you can simply use the ``eslint`` command within the chill-bundles directory.
+This runs eslint **not** taking the baseline into account, thus showing all existing errors in the project.
 
-Interesting options are:
+A script was also added to package.json allowing you to execute ``yarn run eslint``.
+This will run eslint, but **taking the baseline into account**, thus only alerting to newly created errors.
+
+Interesting options that can be used in combination with eslint are:
 
 - ``--quiet`` to only get errors and silence the warnings
 - ``--fix`` to have ESLint fix what it can, automatically. This will not fix everything.