Add JSON Schemas for Object & Note

Don't know if anyone's still watching this repo or not, but I thought I'd send this work upstream all the same. :heart: 

&lt;backstory>
I'm building these JSON Schemas for my own note taking app experiment (working title: "[Sprung](http://github.com/bigbluehat/sprung)"), and am using JSON Schema (or will be) for building the forms via [vue-schema](http://github.com/bigbluehat/vue-schema) and/or [re:form.ed](http://github.com/bigbluehat/reformed).
&lt;/backstory> :smile: 

Anyhow, thought these might be useful to others.

:hand: :five: :smile: