Node shell binary for cli execution

index.js

-
+#!/usr/bin/env node
+
+// PB : TODO -- make sure folder context is proper coz we can now run elxr from anywhere.
+
 // --------------
 // elxr 
 //   A cli tool for elixr.

package.json

   "dependencies": {
     "tree-kill": "^1.2.2",
     "glob": "^7.1.2"
+  },
+  "bin": {
+    "elxr": "./index.js"
   }
 }