add mock db and server. update packages

[jonnyfluckey]

#15

I did a few things to try and make this easy. If you were thinking something else, please let me know.

1. Used the file provided to me to set up the JSON mock information.
2. Added JSON-Server NPM package to launch a mock server.
3. Set up the NPM start script to run React and JSON-server concurrently. That way, the server data is live and can be tested instantly.

Let me know if you have any questions or feedback.

Thanks!

[lpatmo]

@jonnyfluckey Oof sorry, my attempt to resolve merge conflicts caused the build to break XD. Working on fixing now.

[jonnyfluckey]

Thanks!

One thing I forgot to mention. For JSON server, you may have to install the NPM package globally in order to get it to run locally (I think it has to be that way in order for the script command to work)

[lpatmo]

Thanks Jonny! :) I am going to merge your PR in. I didn't know about https://github.com/typicode/json-server before, so this is fantastic.

Note to self: the easiest way to fix package-lock.json syntax errors is to rm the file and re-run npm install