Added the dirs command
Added the dirs command

Fix build & Add definition of stack

Added reference to pushd/popd in description

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