Updated Projects Using usb serial for android (markdown)

Projects-Using-usb-serial-for-android.md

@@ -11,6 +11,7 @@
 * [ELMScan Adapter Validator](https://play.google.com/store/apps/details?id=com.elmscansoft.elmscanadaptervalidator) -- Identification of ELM327 clones and determination of their quality
 * [Microcontroller Remote](https://play.google.com/store/apps/details?id=tk.michaelmckey.microcontrollerremote) -- remote control app
 * [GPS to Serial](https://github.com/XxOinvizioNxX/GPS-to-Serial) -- App to send phone GPS coordinates via USB serial port
+* [Codec2 Talkie](https://github.com/sh123/codec2_talkie) -- Codec2 Walkie-Talkie for DV (digital voice) communication
 
 ## Libraries, Frameworks, and Tools