add bluetooth usage

Bluetooth.md

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+
+# Setup Bluetooth
+
+To connect to wifi we will be using `wpa_cli` tool, first we need to set the credentials for the wifi and then we will initialize the connection by reconfiguiring the wlan0 interface to use new credentials.
+we use `brcm_patchram_plus` tool to setup bluetooth, first we need to trigger reset pin, then upload bluetooth fw.
+
+```shell
+#trigger reset pin
+gpioset gpiochip2 28=0
+gpioset gpiochip2 28=1
+
+#upload fw
+brcm_patchram_plus -d --enable_hci --no2bytes --tosleep 200000 --baudrate 3000000 --patchram /lib/firmware/BCM43013A0_001.001.006.1073.1102.hcd /dev/ttyS4 &
+```
+
+## Check bluetooth interface
+
+```
+root@BeagleV:~# hciconfig 
+hci0:	Type: Primary  Bus: UART
+	BD Address: B8:13:32:EC:59:8B  ACL MTU: 1021:8  SCO MTU: 64:1
+	DOWN 
+	RX bytes:733 acl:0 sco:0 events:42 errors:0
+	TX bytes:464 acl:0 sco:0 commands:42 errors:0
+```
+
+## Using bluetoothctl tool 
+
+
+```
+root@BeagleV:~# bluetoothctl 
+Agent registered
+[CHG] Controller B8:13:32:EC:59:8B Pairable: yes
+[bluetooth]# scan on
+Discovery started
+[CHG] Controller B8:13:32:EC:59:8B Discovering: yes
+[NEW] Device 40:97:1C:DF:8B:BD 40-97-1C-DF-8B-BD
+[NEW] Device 43:07:E7:3F:85:84 43-07-E7-3F-85-84
+[CHG] Device 43:07:E7:3F:85:84 RSSI: -91
+[bluetooth]# quit
+
+```