added photo of e-taxi only charging station

.gitignore

@@ -1,3 +1,5 @@
+.DS_Store
+
 # ---> Python
 # Byte-compiled / optimized / DLL files
 __pycache__/
@@ -93,4 +95,3 @@ ENV/
 
 # Rope project settings
 .ropeproject
-

README.md

@@ -68,6 +68,9 @@ some charging stations in this dataset are not actually installed yet, and are l
 
 ### mapping charging stations restricted to taxis
 
+here's a photo of a taxi-only charging station on tower bridge road:
+![taxi-charging_station](./img/e-taxi-charging-station.jpg)
+
 we received some guidance on [talk-gb-london](https://lists.openstreetmap.org/pipermail/talk-gb-london/2019-April/000184.html) on how to achieve this:
 
 > For the stations that are restricted to taxis... would it be appropriate to use the access=* tag? It is mainly used for roads/paths and gates etc, but I think it is used in other cases to specify "who is allowed to use this feature".