feat: add bin entry for xsh and update shebang in index.js

Author: sanderhd

package.json

@@ -19,6 +19,9 @@
   "author": "sanderhd",
   "type": "module",
   "main": "src/index.js",
+  "bin": {
+    "xsh": "./src/index.js"
+  },
   "scripts": {
     "xsh": "node src/index.js"
   },

src/index.js

@@ -1,3 +1,5 @@
+#!/usr/bin/env node
+
 import chalk from "chalk";
 import readline from "node:readline"
 import { exec } from "node:child_process"