doc: Add AT command set for Dialup Networking

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+This document specifies the AT command set used in the bluetooth ofono plugins.
+
+Bluetooth Dial-up Networking Profile Features Description
+=========================================================
+(Ref. document: Dial-up Networking Profile - Bluetooth specification version 1.1 - 22 February 2001)
+
+- AT COMMAND SET USED:
+Commands:
+	&C	Circuit 109 (DCD) Control
+	&D	Circuit 108 (DTR) Response
+	&F	Set to Factory Defined Configuration
+	+GCAP	Request Complete Capabilities List
+	+GMI	Request Manufacturer Identification
+	+GMM	Read Model Identification
+	+GMR	Read Revision Identification
+	A	Answer Incoming Call
+	D	Dial
+	E	Command Echo
+	H	Hang Up
+	L	Monitor Speaker Loudness
+	M	Monitor Speaker Control
+	O	Return to Online Data Mode
+	P	Select Pulse Dialling
+	Q	Result Code Suppression
+	S0	Automatic Answer Control
+	S10	Automatic Disconnect Delay Control
+	S3	Command Line Termination Character
+	S4	Response Formatting Character
+	S5	Command Line Editing Character (BACKSPACE)
+	S6	Blind Dial Delay Control
+	S7	Connection Completion Timeout
+	S8	Comma Dial Modifier Delay Control
+	T	Select Tone Dialling
+	V	DCE Response Format
+	X	Call Progress Monitoring Control
+	Z	Reset to Default Configuration
+Result codes:
+	OK		Acknowledge execution of a command
+	CONNECT		Connection has been established
+	RING		The DCE has detected an incoming call signal from network
+	NO CARRIER	The connection has been terminated, or attempt to establish
+			a connection failed
+	ERROR		Error
+	NO DIALTONE	No dial-tone detected
+	BUSY		Busy signal detected