adds useful commands to tree
adds useful commands to tree

WANG-lp/tldr,zoisom/tldr,felixonmars/tldr,zoisom/tldr,Parth-Mehrotra/tldr,AgamAgarwal/tldr,WALL-E/tldr,felixonmars/tldr,igorshubovych/tldr,mshmoustafa/tldr,rubenvereecken/tldr,slash3b/tldr,deekim/tldr,katekyan/tldr,slash3b/tldr,cptdeka10/tldr,Parth-Mehrotra/tldr,WALL-E/tldr,cdminigun/tldr,katekyan/tldr,deekim/tldr,UncommonPleb/tldr,UncommonPleb/tldr,Phizho/tldr,slash3b/tldr,ArturSkowronski/tldr,rubenvereecken/tldr,cptdeka10/tldr,cptdeka10/tldr,katekyan/tldr,cdminigun/tldr,UncommonPleb/tldr,Phizho/tldr,felixonmars/tldr,davidsiefert/tldr,igorshubovych/tldr,mshmoustafa/tldr,davidsiefert/tldr,AgamAgarwal/tldr,Phizho/tldr,deekim/tldr,zoisom/tldr,kuanyui/tldr,ArturSkowronski/tldr,WANG-lp/tldr,kuanyui/tldr