add api document

docs/api/createNavLink.md

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+# createNavLink
+
+`createNavLink` is a function for you to create a NavLink component, you are able to pass options to overwrite attributes to generate the NavLink. e.g., custom mixin or click handler.
+
+## Parameters
+
+| Param Name | Param Type | Description |
+|-----------|-----------|-------------|
+| options | Object | the object taken to overwrite the default attribute when we create NavLink |
+
+
+## Example Usage
+
+```js
+var createNavLink = require('fluxible-router').createNavLink;
+
+module.exports = createNavLink({
+    displayName: 'CustomNavLink',
+    mixins: [someMixin],
+    clickHandler: function (e) {
+        // custom click handler
+        this.dispatchNavAction(e);
+    }
+});
+```