This is the message I sent. If someone is lazy to write their own, please use this as a template, make changes and send to the PM. Unfortunately, we can send only upto 500 chars long messages. My message is 477 chars and communicates the intent. If you want add/modify/remove something from/to the message to make the message more effective.

Honorable Sir, Yesterday an order issued by DoT blocked 32 websites including Github and Codepad which are used by scientists/engineers/researchers/students for collaboration in academic/professional/research work. As an ambitious engineer from India who is passionate towards nation building, I request you to instruct concerned authorities to revisit the decision for blocking full github.com website instead of just the specific pages which contained objectionable material.