Add build status badge.

.github/workflows/build.yml

@@ -1,4 +1,4 @@
-name: "FAP: Build for dev and release SDK"
+name: "FAP Build"
 on:
   push:
     branches:

README.md

@@ -1,5 +1,7 @@
 # GPS for Flipper Zero
 
+[![FAP Build](https://github.com/ezod/flipperzero-gps/actions/workflows/build.yml/badge.svg)](https://github.com/ezod/flipperzero-gps/actions/workflows/build.yml)
+
 A simple Flipper Zero application for NMEA 0183 serial GPS modules, such as the
 [Adafruit Ultimate GPS Breakout].