Added PostcodeData.nl

.gitignore

@@ -0,0 +1 @@
+.idea

README.md

@@ -84,6 +84,7 @@ A collective list of JSON APIs for use in web development.
 | API | Description | OAuth |Link |
 |---|---|---|---|
 | OpenCage | Forward and reverse geocoding using open data | No | [Go!](https://geocoder.opencagedata.com) |
+| PostcodeData.nl | Provide geolocation data based on postcode for Dutch addresses | No | [Go!](http://api.postcodedata.nl/v1/postcode/?postcode=1211EP&streetnumber=60&ref=domeinnaam.nl&type=json) |
 
 ### Media