Updated Introduction (markdown)

Introduction.md

@@ -1,7 +1,9 @@
 ![alt text](https://raw.githubusercontent.com/sh123/esp32_loraprs/master/images/diagram.png)
 
+# Description
 Amateur radio ESP32 based LoRa APRSDroid KISS Bluetooth modem + LoRa APRS-IS RX/TX iGate server over WiFI + digipeater + Codec2 DV modem (in conjunction with Android frontend application)
 
+# Features
 Can be used in two modes, mode seleciton is done by changing `cfg.IsClientMode` or `CFG_IS_CLIENT_MODE` define in `config.h`:
 - **LoRa APRS KISS client over bluetooth**, WiFi and iGate are switched off, mobile or portable usage (/M, /P)
   - you need to use **APRSDroid** application (https://aprsdroid.org) or iOS aprs.fi official application, connect to the modem using bluetooth, data will be re-transmitted through the LoRa radio, this is similar to APRSDroid micromodem - https://unsigned.io/micromodem/, received data will be sent back to the APRSDroid using bluetooth
@@ -14,5 +16,6 @@ Can be used in two modes, mode seleciton is done by changing `cfg.IsClientMode`
   - **Beaconing**, own station periodic beacon announcement to APRS-IS and RF
   - if `cfg.BtName` is NOT set to empty string then server mode also allows to connect with KISS bluetooth client and use it simulatenously with iGate functionality, e.g. when stationary at home and want to use DV Codec2 Walkie-Talkie voice communication
 
+# Voice over LoRa  
 Modem could also be used for **LoRa Codec2 digital voice DV communication**
   - just install [Codec2 Walkie-Talkie](https://github.com/sh123/codec2_talkie) on you Android phone, pair with the modem and you can communicate with each other by using digital voice [Codec2](http://www.rowetel.com/?page_id=452), also modem can be controlled from this application (frequency change, bandwidth, spreading factor, etc)