Add README

README.md

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+This repository/module contains JSON Schema definitions as well as examples for
+Kosmos data formats.
+
+## Usage
+
+You can import these schemas to validate data in JavaScript programs. For
+example using npm and the [tv4](https://www.npmjs.com/package/tv4) JSON Schema
+validator:
+
+```js
+let tv4 = require('tv4');
+let schemas = require('kosmos-schemas');
+
+let result = tv4.validate(contributor, schemas['contributor']);
+
+if (result) {
+  console.log('Your data is valid');
+} else {
+  console.log('Your data is not valid:');
+  console.log(tv4.error);
+}
+```
+
+## TODO
+
+* Add script for publishing both human- and machine-readable schemas to
+  https://schemas.kosmos.org