added alias for apt-cache search

plugins/deb/deb.plugin.zsh

@@ -9,4 +9,5 @@ alias ar="sudo apt-get remove --purge && \
 		sudo apt-get autoremove --purge"	# remove package
 alias ap="apt-cache policy"				# apt policy
 alias av="apt-cache show"				# show package info
+alias acs="apt-cache search"                            # search package
 alias ac="sudo apt-get clean && sudo apt-get autoclean" # clean apt cache