Added switching-between-datasets example

examples/switching-between-datasets/README.md

@@ -0,0 +1,20 @@
+
+# Switching Between Datasets
+
+Example of using `react-simple-maps` to create a choropleth map of the world that can toggle between displaying population data or the subregions of the world according to the [UN Statistics Division](https://unstats.un.org/unsd/methodology/m49/).
+
+## How to use
+
+Download this example map [or clone the repo](https://github.com/zcreativelabs/react-simple-maps):
+
+```bash
+curl https://codeload.github.com/zcreativelabs/react-simple-maps/tar.gz/master | tar -xz --strip=2 react-simple-maps-master/examples/switching-between-datasets
+cd switching-between-datasets
+```
+
+Once you have downloaded the example install the dependencies and run the app.
+
+```bash
+npm install
+npm run dev
+```