Bluetooth Tutorial description added

Author: miguelrochajr

BluetoothTutorial/README.md

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+# BLE Tutorial using CoreBletooth
+
+This project was done by following the tutorial [Zero to BLE os iOS](https://www.cloudcity.io/blog/2015/06/11/zero-to-ble-on-ios-part-one/)
+
+It is important to mention that the original project ((FOUND HERE)[https://github.com/cloudcity/ZeroToBLE-Part2-Swift]) was written in Swift 3 while this was written in Swift 3. Another thing to be aware is that here I am not using the SensorTag from Texas Instruments. I am using a smart padlock.