I have existing code on my computer, then I have registerd my account on sourceforge, starting a git project. Now I need to send my local project on sourceforge remote space
The single-quote ' is the problem. Change it to double-quotes, like "initial commit". Use double-quotes in Windows-cmd instead of single-quote.
@AndrewC: read this before doing the downvote: http://git-scm.com/book/en/Git-Basics-Recording-Changes-to-the-Repository#Skipping-the-Staging-Area