phpBBModders.net

Can a script uploaded in github have malecious code?, If yes how to detect it easily?

yes it can ,but want be an active script unless you download it.
If you want to detect then you will need to know what you are looking for, google: malecious code
Why do you ask?

Thanks for the reply.

I am interested in the following script though I didn't try.
https://github.com/savinmathew/matrimonial

Does google have any service to detect it?

Too many files to read there ,what's the concern about them?
Take a look at this page: http://www.unmaskparasites.com/

I think that is a matrimonial script, and thanks for the link.