add maps engine examples
diff --git a/samples/maps_engine/polygons.prj b/samples/maps_engine/polygons.prj
new file mode 100644
index 0000000..a30c00a
--- /dev/null
+++ b/samples/maps_engine/polygons.prj
@@ -0,0 +1 @@
+GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]]
\ No newline at end of file