Basic setup

groundwork for building out full installable
- add basic readme info
- set up `karma.conf.js`
- add `package.json` with rudimentary dependencies, test script, info
- add empty test files to be filled out
- create empty `index.js` module export
Ok, seems like you know what its called. So let's not call it something confusing like `PostalService`. Since it produces HTTP methods/clients, we could call it something like that. Generally we name things in a way that describes them. 

https://github.com/yola/demands/blob/master/demands/__init__.py#L28