created readme for code directory

Author: albertoabellagarcia

OSMWaterway/code/README.md

@@ -0,0 +1,14 @@
+# OSMWaterway
+
+### List of code samples 
+
+<!-- 50-List of code -->
+
+<!-- [code entry](link) -->
+[code_for_using_dataModel.OpenStreetMap_OSMWaterway.py](https://github.com/smart-data-models/dataModel.OpenStreetMap/blob/master/OSMWaterway/code/code_for_using_dataModel.OpenStreetMap_OSMWaterway.py)
+
+
+<!-- /50-List of code -->
+
+### Contribution
+You can raise an [issue](https://github.com/smart-data-models/dataModel.OpenStreetMap/issues) or submit your [PR](https://github.com/smart-data-models/dataModel.OpenStreetMap/pulls) on existing data models