update README.md

README.md

@@ -5,6 +5,20 @@
 
 [WIP] JSON Schema Draft 6 plugin for [Skeeler](https://github.com/Cap32/skeeler)
 
+## Table of Contents
+
+<!-- MarkdownTOC -->
+
+* [Simple Example](#simple-example)
+  * [Equals to JSON Schema Draft 6](#equals-to-json-schema-draft-6)
+* [Options](#options)
+* [Related projects](#related-projects)
+* [License](#license)
+
+<!-- /MarkdownTOC -->
+
+<a name="simple-example"></a>
+
 ## Simple Example
 
 ```js
@@ -29,10 +43,13 @@ const mySkeeler = new Skeeler({
 export default mySkeeler.export('json');
 ```
 
+<a name="equals-to-json-schema-draft-6"></a>
+
 ### Equals to JSON Schema Draft 6
 
 ```js
 export default {
+  type: 'object',
   properties: {
     foo: {
       type: 'string',
@@ -70,10 +87,68 @@ export default {
 };
 ```
 
+<a name="options"></a>
+
+## Options
+
+By default, all the schema definitions will be compiled to `properties` in JSON schema, and the root type is `object`.
+
+#### `other` option
+
+If you want to pass some attributes outside `properties`, you may use `other` option.
+
+###### Example
+
+```js
+const skeeler = new Skeeler({});
+const options = { other: { title: 'awesome' } };
+skeeler.export('json', options);
+
+/**
+ * output
+ *
+ * { type: 'object', properties: {}, title: 'awesome' }
+ */
+```
+
+#### `strict` option
+
+If you want to writing in native JSON Schema way, you may use `strict` option.
+
+###### Example
+
+```js
+const skeeler = new Skeeler({
+  properties: {
+    foo: types.string,
+    bar: types.number,
+  },
+  required(['foo', 'bar']),
+});
+const options = { strict: true };
+skeeler.export('json', options);
+
+/**
+ * output
+ *
+ * {
+ *  properties: {
+ *    foo: { type: 'string' },
+ *    bar: { type: 'number' },
+ *  },
+ *  required: ['foo', 'bar'],
+ * }
+ */
+```
+
+<a name="related-projects"></a>
+
 ## Related projects
 
 * [Skeeler](https://github.com/Cap32/skeeler)
 
+<a name="license"></a>
+
 ## License
 
 MIT