[ENH] Add ci badge (#696)

* didn't know that was a risk here. (from play store report)

* adding CI badge

* updating URL

---------

Co-authored-by: Andy Carra <rksh@wigle.net>

README.md

@@ -1,5 +1,7 @@
 # WiGLE Wireless Wardriving
 
+![ci badge](https://github.com/wiglenet/wigle-wifi-wardriving/actions/workflows/android.yml/badge.svg)
+
 Nethugging client for Android, from [wigle.net](https://wigle.net). 
 
 This client provides geolocated detection and logging for WiFi, Bluetooth, and cellular signals using Android devices.