Added autocompletion for fish shell

autocompletion/cheat.fish

@@ -0,0 +1,9 @@
+#completion for cheat
+complete -c cheat -s h -l help -f -x --description "Display help and exit"
+complete -c cheat -s e -l edit -f -x --description "Edit <cheatsheet>"
+complete -c cheat -s l -l list -f -x --description "List all available cheatsheets"
+complete -c cheat -s d -l cheat-directories -f -x --description "List all current cheat dirs"
+complete -c cheat --authoritative -f
+for cheatsheet in (cheat -l | cut -d' ' -f1)
+    complete -c cheat -a "$cheatsheet"
+end