add hw2

node_modules/bare-events/README.md

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+# bare-events
+
+Event emitters for JavaScript.
+
+```
+npm install bare-events
+```
+
+## Usage
+
+```js
+const EventEmitter = require('bare-events')
+
+const e = new EventEmitter()
+
+e.on('hello', function (data) {
+  console.log(data)
+})
+
+e.emit('hello', 'world')
+```
+
+## License
+
+Apache-2.0