Add BLE GATT Services and Characteristics

BLE-GATT-Services-and-Characteristics.md

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+Overview of Services and Characteristics need for Barback to communicate between one another, between their respective Barheads in addition to external devices such as a phone or laptop.
+Each tree is from the device prospective. eg;
+
+* Device
+* * Service
+* * * Characteristic
+
+# BLE GATT
+
+* Barback
+* * Config
+* * * Name - (string) [rwn]
+* * * Barhead MAC - (6 bytes) [rwn]
+* * Control
+* * * Arm - (bool) [rwn]
+* * * Pour - (true) [wn]
+* * Prime
+* * * Pump [...n] - (bool) [wn] (This is a manual on/off for an individual motor (n))
+* * Motor [...n]
+* * * Run Time - (ms) [rwn]
+* * * Max Speed - (PWM) [rwn]
+* * * Ramp Time - (ms) [rwn] (could be something else like a percent, ie; 3 will ramp over the first 3% of total run time)
+* * * Start Delay - (ms) [rwn] (this could be useful for incorporating the air pump)