add 125 kHz rfid page

README.md

@@ -9,3 +9,4 @@ Kickstarter page: [kickstarter.com](https://www.kickstarter.com/projects/flipper
 ## Modules/features
 
 * [Sub-1 GHz radio](wiki/sub-1ghz-radio.md)
+* [125 kHz RFID](wiki/125khz-rfid.md)