"If someone can tell me how to put a disclaimer in the footer"
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.