I am using this codebase - https://github.com/nex3/arc
If someone can tell me how to put a disclaimer in the footer, I will put it rightaway.
The right way is to change the name. If I start a site called Google India, or even Digg India, it isn't enough (legally or ethically) to have a disclaimer in the footer, even if I am running a non profit. You keep repeating the "this is not for profit" sentence. That isn't a valid defense against brand name abuse.
At the very least get permission from the owners on the original site before starting a new site by adding an "India" to its name.
The last thing "Indian hackers" need is a reputation for ripping off other peoples work/brands (As if the outsourcing horror stories aren't enough). Use the open source code, by all means. But don't copy the name.
I am an Indian developer and I think such unabashed copying of a popular brand is shameful. YMMV.
Even if the source was free, the brand need not be and in that case HNI would be plain illegal.
Its been mentioned here that Firefox is open source but they own the brand. If hypothetically speaking, you start distributing Firefox with its proxy settings customized for Indian ISPs and call it Firefox-India, the chances are high that you will hear from lawyers.