Add a base eslintrc.js for IDE linter compatibility.
Add a base eslintrc.js for IDE linter compatibility.

mrpau/kolibri,lyw07/kolibri,indirectlylit/kolibri,mrpau/kolibri,indirectlylit/kolibri,lyw07/kolibri,mrpau/kolibri,mrpau/kolibri,learningequality/kolibri,learningequality/kolibri,indirectlylit/kolibri,lyw07/kolibri,indirectlylit/kolibri,lyw07/kolibri,learningequality/kolibri,learningequality/kolibri