Add index.js used to test xterm-core

node-test/README.md

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+Cursory test that 'xterm-core' works:
+
+```
+# From root of this repo
+npm run compile # Outputs to xterm-core
+npx webpack --config core-webpack.config.js # Outputs to lib
+cd node-test
+npm link ../lib/
+node index.js
+```

node-test/index.js

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+import { createRequire } from 'module';
+const require = createRequire(import.meta.url);
+const xterm = require('xterm-core');
+
+console.log('Creating xterm-core terminal...');
+const terminal = new xterm.Terminal();
+console.log('Writing `ls` to terminal...')
+terminal.write('ls', () => {
+  const bufferLine = terminal.buffer.normal.getLine(terminal.buffer.normal.cursorY);
+  const contents = bufferLine.translateToString();
+  console.log(`Contents of terminal active buffer are: ${contents}`); // ls
+});

node-test/package.json

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+{
+  "name": "test",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "type": "module",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": ""
+}