osm-garmin: add TODOs for future features

osm-garmin/app/build-gmap.sh

@@ -8,6 +8,11 @@ style="$2"
 cwd="$(pwd)"
 
 function build_gmap() {
+    # TODO: Set name (currently is "OSM street map")
+    #       Use --housenumbers?
+    #       A way to pass extra options
+    #       Change ID (currently is 63240000)
+
     region="$1"
     style="$2"