Usage Instruction Modification

[agatlin]

For users unfamiliar with the Node Package Manager (NPM), it would be useful to add an instruction that they must first verify that they have NPM installed by running npm -v and maybe telling them where to download it if they do not.

Once users have verified they have NPM installed, they should be instructed to run npm install before executing npm start. (Otherwise, they will get an error which many may find confusing.) It may also be a good idea to tell them that Neuler is going to download more than two thousand packages so it may take a while--especially on a slow connection.

Users may also be instructed that they can combine these commands with npm install && npm start.

[tomasonjo]

Thanks for letting us know. It would make sense to update the README file