Dear Hari and others,
I think there is no obvious need whatsoever for an "Indian language developers list". If there are issues the require attention and discussion related to language support in MediaWiki, there are three mailing lists that qualify for discussion already – depending on the exact topic -, and bugzilla[1] is the place to register the issue. Please be aware that cocooning leads to separation, while one of the strongpoints of the Wikimedia movements is being involved worldwide.
Mailing lists: