add readme and license info

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2016 Adafruit Industries
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+

README.md

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+# MPR121 Library for Node.js
+
+This library allows you to access a MPR121 breakout using Node.js from a Raspberry Pi or BeagleBone Black.
+
+## Installation
+
+This library requires Node.js v6.0.0 or higher.
+
+```sh
+$ npm install mpr121
+```
+
+## Example
+
+```js
+const MPR121 = require('mpr121'),
+      mpr121  = new MPR121(0x5A, 1);
+
+// listen for touch events
+mpr121.on('touch', (pin) => console.log(`pin ${pin} touched`));
+
+// listen for release events
+mpr121.on('release', (pin) => console.log(`pin ${pin} released`));
+
+// listen for changes to the state of a specific pin
+mpr121.on(3, (state) => console.log(`pin 3 is ${state ? 'touched' : 'released'}`);
+
+// check the current state of a specific pin synchronously
+const state = mpr121.isTouched(2);
+console.log(`pin 2 is ${state ? 'touched' : 'released'}`);
+```
+
+## License
+
+Copyright (c) 2016 Adafruit Industries. Licensed under the MIT license.