Tweaked README, added image.

README.md

@@ -1,5 +1,9 @@
+![Image](assets/dialer.jpg)
+
 ## DTMF Dolphin
 
-Dialer, and future Bluebox and Redbox for the Flipper Zero.
+DTMF (Dual-Tone Multi-Frequency) dialer, and future Bluebox and Redbox for the Flipper Zero.
+
+Documentation and code completion pending. This is a work in progress.
 
-Documentation and code completion pending. This is a work in progress.
+Warning: may induce feelings of nostalgia and/or actual timetravel to the '80s/'90s.