Create README.

Author: ezod

README.md

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+# GPS for Flipper Zero
+
+A simple Flipper Zero application for NMEA 0183 serial GPS modules, such as the [Adafruit Ultimate GPS Breakout].
+
+## Hardware Setup
+
+Connect the GPS module to power and the USART using GPIO pins 9 (3.3V), 11 (GND), 13 (TX), and 14 (RX), as appropriate.
+
+## Building the FAP
+
+1. Clone the [flipperzero-firmware] repository.
+2. Create a symbolic link in `applications_user` named `gps`, pointing to the `src` subdirectory of this repository.
+3. Compile with `./fbt firmware_gps`. This will create the `gps.fap` binary.
+
+[Adafruit Ultimate GPS Breakout]: https://www.adafruit.com/product/746
+[flipperzero-firmware]: https://github.com/flipperdevices/flipperzero-firmware