OSB-6: add example in the cmake documentation

CMake/NPMInstall.cmake

@@ -4,6 +4,20 @@
 # public_dir is the directory where the static files are stored
 # source_dir is the directory where the javascript/css files are stored
 
+##
+## NPM/REACT Quickstart tutorial
+## The tool create-react-app can be used to create a barebone react html/js project.
+## This tool can be installed systemwide with npm executing the command '#npm install -g create-react-app'. 
+## Then, the barebone project setup can be created in the [project-directory] executing the command
+## '$create-react-app [project-directory]'
+## The script will create the [project-directory], if it doesnt exist, containing the public and src folder and default package.json file, 
+## it will download the basic dependencies and will start a git repository in the [project-directory].
+## However, the file/directories required are only the public and the src directory and the package.json file. 
+## PLEASE MAKE SURE TO COPY ONLY THOSE FILES/DIRECTORIES IN THE LOFAR SRC TREE!
+## Finally, the cmake file for the project has to contains these two lines to make the LOFAR cmake setup build the project
+## 'include(NPMInstall)'
+## 'npm_install([package.json file] PUBLIC [public directory] SOURCE [source directory] DESTINATION [install destination folder])'
+
 # Copyright (C) 2008-2009
 # ASTRON (Netherlands Foundation for Research in Astronomy)
 # P.O.Box 2, 7990 AA Dwingeloo, The Netherlands, softwaresupport@astron.nl