Add mention bot
Add mention bot

Adds a custom configuration file for mention bot:
https://github.com/facebook/mention-bot which will be eventually
enabled in order to ping people on relevant PR's.

kadel/kedge,cdrage/kedge,surajnarwade/kedge,surajnarwade/kedge,cdrage/kedge,kedgeproject/kedge,cdrage/kedge,kedgeproject/kedge,kadel/kedge,surajnarwade/kedge,ashetty1/kedge,ashetty1/kedge,kedgeproject/kedge