Add documentation and documentation testing

docs/src/prepareSettings.md.ejs

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+## prepareSettings
+
+`prepareSettings(address: string, settings: Object, instructions: Object): Promise<Object>`
+
+Prepare a settings transaction. The prepared transaction must subsequently be [signed](#sign) and [submitted](#submit).
+
+### Parameters
+
+<%- renderSchema('input/prepare-settings.json') %>
+
+### Return Value
+
+This method returns a promise that resolves with an object with the following structure:
+
+<aside class="notice">
+All "prepare*" methods have the same return type.
+</aside>
+
+<%- renderSchema('output/prepare.json') %>
+
+### Example
+
+```javascript
+const address = 'r9cZA1mLK5R5Am25ArfXFmqgNwjZgnfk59';
+const settings = <%- importFile('test/fixtures/requests/prepare-settings.json') %>;
+return api.prepareSettings(address, settings)
+  .then(prepared => {/* ... */});
+```
+
+<%- renderFixture('requests/prepare-settings.json') %>