Add docs for createRest

Author: sergeysova

lib/index.js

@@ -1,5 +1,14 @@
 import { createContext } from './context'
 
+/**
+ *
+ * @param {Object} config Root configuration
+ * @param {Function} applyRoot Main childs for root `childs()`
+ * @example
+ * const routes = createRest({}, childs(
+ *   resources('article', {}, ArticlesController)
+ * ))
+ */
 export function createRest(config, applyRoot) {
   const context = createContext()