add basic readme (#23)

README.md

@@ -0,0 +1,41 @@
+# React Tress
+
+[![Build Status](https://travis-ci.org/kenshoo/react-tree.svg?branch=master)](https://travis-ci.org/kenshoo/react-tree)
+[![Test Coverage](https://api.codeclimate.com/v1/badges/7b44acc9042c5ee410a8/test_coverage)](https://codeclimate.com/github/kenshoo/react-tree/test_coverage)
+
+Code usage:
+
+
+ <!-- example -->
+
+```jsx
+import ReactTree from "@kenshooui/react-tree";
+
+const structure = [
+  ["Profiles", "Performance", "Clicks"],
+  ["Profiles", "Performance", "Imp"],
+  ["Profiles", "Attribute", "Agency"],
+  ["Profiles", "Attribute", "Progress"],
+  ["Profiles", "Attribute", "Create Date"],
+  ["Campaigns", "Performance", "Clicks"],
+  ["Campaigns", "Performance", "Cost"],
+  ["Campaigns", "Performance", "CTR"],
+  ["Campaigns", "Attribute", "campaign name"],
+  ["Ad Groups", "Attribute", "Ad Group Name"]
+];
+
+<ReactTree
+  structure={structure}
+  title={"Add filter criteria"}
+  onSelect={() => {}}
+/>;
+```
+
+## Props
+
+| Name                | Type      | Default                | Description                                                     |
+| :------------------ | :-------- | :--------------------- | :-------------------------------------------------------------- |
+| `structure`         | `Array`   | `[]`                   | `Component input - array of leaves along with their ancestors`  |
+| `title`             | `String`  | ``                     | `Title to be displayed on root mode`                            |
+| `onSelect`          | `Func`    | ``                     | `callback when clicking a leaf`                                 |
+| `NoResultsRenderer` | ``        | `no_matching_items.js` | `renderer when having no results on searching`                  |