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