Creates a developer environment using express

[d80ep08th]

fixes #19

Creates a process that requests rugpullindex.com 's index side.
Serves this content to a developer after running : npm run dev

[TimDaub]

please put node_modules in .gitignore.

[il3ven]

@d80ep08th The node_modules are still on your branch. Follow the steps here to remove them. https://stackoverflow.com/a/1139797

[TimDaub]

There were two commits that included all node_modules, so I had to do some rebasing to clean up the branch on your remote @d80ep08th. It's now ready for review. I also changed the licensing in bd0e75b.

[TimDaub]

It works, but I found a functional bug. To reproduce:

1. Run npm run dev, check localhost:5000, website works and everything runs fine
2. Kill the process
3. Rerun npm run dev, now we get an error message

> design-system@1.0.0 dev /Users/user/Projects/rpi-design-system
> nodemon index.js

[nodemon] 2.0.15
[nodemon] to restart at any time, enter `rs`
[nodemon] watching path(s): *.*
[nodemon] watching extensions: js,mjs,json
[nodemon] starting `node index.js`
rugpullindex runs on localhost:5000/
[Error: EEXIST: file already exists, mkdir '/Users/user/Projects/rpi-design-system/cache'] {
  errno: -17,
  code: 'EEXIST',
  syscall: 'mkdir',
  path: '/Users/user/Projects/rpi-design-system/cache'
}

Also: We should put the cache folder in .gitignore too.