Add Process.toml (#1361)

* Add Process.toml

* Apply suggestions from code review

Co-authored-by: Robert Habermeier <rphmeier@gmail.com>

polkadot/Process.toml

+[Batch: Availability and Validity]
+owner = "rphmeier"
+whitelist = []
+matrix_room_id = "!wQXGIDhhJQSVXKqPwi:matrix.parity.io"
+
+[Batch: Codebase Restructure]
+owner = "rphmeier"
+whitelist = []
+matrix_room_id = "!wQXGIDhhJQSVXKqPwi:matrix.parity.io"
+
+[Cumulus]
+owner = "bkchr"
+whitelist = []
+matrix_room_id = "!wQXGIDhhJQSVXKqPwi:matrix.parity.io"
+