Add CLI written in Node

cli/execute

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+node src $*

cli/package.json

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+{
+  "name": "cli",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC"
+}

cli/src/index.js

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+const { execute } = require('../../shared/execute');
+const { readFileSync } = require('fs');
+const languages = require('../../shared/languages.json');
+
+const [languageName, sourceFile, ...args] = process.argv.slice(2);
+
+(async () => {
+    if (!languageName) {
+        console.error('Provide a language name');
+        return;
+    }
+    
+    if (!sourceFile) {
+        console.error('Provide a source file');
+        return;
+    }
+
+    const source = readFileSync(sourceFile);
+
+    const language = languages.find(language => language.name === languageName);
+
+    if (!language) {
+        console.error(`${languageName} is not supported by Piston`);
+        return;
+    }
+
+    const { output } = await execute(language, source, args);
+
+    console.log(output);
+})();