Add .ignore file to tell ag to ignore the external directory when searching in mcapp.projects/src/app.
Add .ignore file to tell ag to ignore the external directory when searching in mcapp.projects/src/app.

materials-commons/materialscommons.org,materials-commons/materialscommons.org,materials-commons/materialscommons.org,materials-commons/materialscommons.org,materials-commons/materialscommons.org