Create README.md

<p>This add-ons pricing data is Powered by <a href="http://www.coindesk.com/price/" target="_blank">CoinDesk</a>, <a href="https://blockchain.info/wallet" target="_blank">blockchain.info</a>, <a href="https://coinbase.com/" target="_blank">Coinbase.com</a>, <a href="https://bitpay.com/" target="_blank">BitPay.com</a> and <a href="https://localbitcoins.com/" target="_blank">LocalBitcoins.com</a>. You can adjust the update times in Preferences. You can add a bitcoin address to check the balance and recent transactions automatically.  Also comes with a currency converter.
              Currency is formatted using toFixed(decimals) and toLocaleString(), results may vary. In some instances padding and rounding may occur. Converter uses 8 decimal places for BTC conversion. QR Codes are generated client-side (in browser) using <a href="https://github.com/jeromeetienne/jquery-qrcode" target="_blank" >jquery-qrcode</a>.
             </p>   

## License
GNU General Public License
http://www.gnu.org/licenses/gpl-3.0.html

## Dependencies && Credits
addon-sdk: https://github.com/mozilla/addon-sdk/
jquery: https://github.com/jquery/jquery
bootstrap: https://github.com/twbs/bootstrap (css, collapse, transition)
jquery-qrcode: https://github.com/jeromeetienne/jquery-qrcode