added a shiny bash-autocomplete script

hecl/extra/hecl_autocomplete.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+_hecl ()
+{
+    local word=${COMP_WORDS[COMP_CWORD]}
+    local filecmds=(init add group cook clean package)
+    
+    if [ $COMP_CWORD == 1 ]
+    then
+        COMPREPLY=($(compgen -W "${filecmds[*]} help" "${word}"))
+        return 0
+    elif [ $COMP_CWORD == 2 ]
+    then
+        case ${COMP_WORDS[1]} in
+        init|add|group|cook|clean|package)
+            COMPREPLY=($(compgen -f -- "${word}"))
+            ;;
+        help)
+            COMPREPLY=($(compgen -W "${filecmds[*]}" "${word}"))
+            ;;
+        esac
+    fi
+}
+
+complete -F _hecl hecl
+