[x3d-public] note on node_modules in x3d-code/www.web3d.org/x3d/content/examples/

[John Carlson]

Don, it should be sufficient to have a package.json and 
package-lock.json checked in, and not the node_modules folder. Indeed, 
node_modules should be ignored by svn if you can arrange for that.  
People can run npm install to recreate node_modules, and I believe that 
is SOP for node developers.  If you discover otherwise, let me know.  
I've been proved wrong before, most recently about closures in Java (I 
had assumed that lambdas implied closures, whoops!).

Thanks,

John