Added some extra info to contributing guide
Added some extra info to contributing guide

ethouris/srt,Cinegy/srt,Cinegy/srt,Cinegy/srt,ethouris/srt,Haivision/srt,Haivision/srt,ethouris/srt,Cinegy/srt,ethouris/srt,Haivision/srt,Haivision/srt