Added contributing guidelines on tldr-lint
Added contributing guidelines on tldr-lint

felixonmars/tldr,rubenvereecken/tldr,slash3b/tldr,AgamAgarwal/tldr,Phizho/tldr,katekyan/tldr,deekim/tldr,cptdeka10/tldr,AgamAgarwal/tldr,slash3b/tldr,UncommonPleb/tldr,igorshubovych/tldr,katekyan/tldr,mshmoustafa/tldr,Phizho/tldr,cptdeka10/tldr,zoisom/tldr,rubenvereecken/tldr,felixonmars/tldr,deekim/tldr,WALL-E/tldr,kuanyui/tldr,cptdeka10/tldr,igorshubovych/tldr,katekyan/tldr,kuanyui/tldr,zoisom/tldr,slash3b/tldr,WALL-E/tldr,Phizho/tldr,felixonmars/tldr,UncommonPleb/tldr,zoisom/tldr,mshmoustafa/tldr,UncommonPleb/tldr,deekim/tldr