Add NONFREE.md with Famxplor family travel Web map

Author: alt250

NONFREE.md

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+# Non-Free Projects
+
+The projects listed here are cool too, but they require payment or do not publish their sources. 
+These products are separated from the main list to keep the main focus on FOSS projects.
+
+## Contents
+
+* [Maps](#maps)
+  * [Web Maps](#web-maps)
+
+## Maps
+
+### Web Maps
+
+* [Famxplor](https://famxplor.com/) - Explore a world map of travel blogs with child-tested activities and family vacation ideas from around the globe. (gratis, closed-source)