adding "user-contrib" directory to ".gitignore"
adding "user-contrib" directory to ".gitignore"

ejgallego/coq,maximedenes/coq,gares/coq,william-lawvere/coq,coq/coq,JasonGross/coq,Ptival/coq,letouzey/coq-wip,william-lawvere/coq,Matafou/coq,ppedrot/coq,coq/coq,JasonGross/coq,silene/coq,maximedenes/coq,SkySkimmer/coq,letouzey/coq-wip,ejgallego/coq,Lionel-Rieg/coq,coq/coq,SkySkimmer/coq,Ptival/coq,Zimmi48/coq,Matafou/coq,gares/coq,amintimany/coq,Lionel-Rieg/coq,mattam82/coq,william-lawvere/coq,maximedenes/coq,Zimmi48/coq,letouzey/coq-wip,silene/coq,Lionel-Rieg/coq,amintimany/coq,JasonGross/coq,coq/coq,ppedrot/coq,Ptival/coq,ejgallego/coq,SkySkimmer/coq,ejgallego/coq,SkySkimmer/coq,gares/coq,letouzey/coq-wip,mattam82/coq,ppedrot/coq,letouzey/coq-wip,maximedenes/coq,mattam82/coq,gares/coq,silene/coq,Zimmi48/coq,maximedenes/coq,amintimany/coq,JasonGross/coq,Matafou/coq,Zimmi48/coq,gares/coq,ppedrot/coq,ppedrot/coq