add nfc

README.md

@@ -16,4 +16,5 @@ Kickstarter page: [kickstarter.com](https://www.kickstarter.com/projects/flipper
 * [GPIO/HW tools](wiki/gpio-hw.md)
 * [USB](wiki/usb.md)
 * [Bluetooth](wiki/bluetooth.md)
+* [NFC](wiki/nfc.md)
 

wiki/nfc.md

@@ -0,0 +1,3 @@
+# NFC module
+
+The NFC standard (ISO-14443) operates at 13.56MHz. We are going to use the TI TRF7970A chip, the same chip as used in the HydraNFC project.