Add UnifiedNlp NominatimGeocoderBackend

Disabled build until upstream releases/tags it.
Though I tested it, and it is usable

metadata/org.microg.nlp.backend.nominatim.txt

@@ -0,0 +1,26 @@
+Categories:Navigation
+License:Apache2
+Web Site:https://github.com/microg/NominatimGeocoderBackend
+Source Code:https://github.com/microg/NominatimGeocoderBackend
+Issue Tracker:https://github.com/microg/NominatimGeocoderBackend/issues
+
+Summary:UnifiedNlp geocoding provider (MapQuest's Nominatim)
+Description:
+[https://github.com/microg/android_packages_apps_UnifiedNlp UnifiedNlp] backend 
+that uses MapQuest's Nominatim service (based on OpenStreeMap) for geocoding.
+.
+
+Repo Type:git
+Repo:https://github.com/microg/NominatimGeocoderBackend
+
+Build:1.0.0,1000
+    disable=no upstream release yet
+    commit=93896662053a2a27717fa87e666130c2253854a6
+    srclibs=1:UnifiedNlpApi@v1.1.2
+    target=android-21
+
+Auto Update Mode:None
+Update Check Mode:Tags
+Current Version:1.0.0
+Current Version Code:1000
+