add README

README.md

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+# AndroidArcMenu
+
+An easy-to-use arc Menu library for Android.
+
+![Demo][demo_gif]
+
+# Sample
+
+[![Get it on Google Play][googleplay_store_badge]][demo_app]
+
+or
+
+[demo.apk](demo_apk)
+
+#Including in Your Project
+
+```groovy
+repositories {
+    jcenter()
+}
+```
+
+```groovy
+compile 'com.hackplan:AndroidArcMenu:1.0.0'
+```
+
+# Usage
+## Basic
+```java
+arcMenu = new ArcMenu.Builder(activity)
+        .setId(ARC_MENU_ID_1)
+        .addBtn(R.drawable.a, id1)
+        .addBtn(R.drawable.b, id2)
+        .setListener(listener)
+        .showOnTouch(btn2)
+        .hideOnTouchUp(false)
+        .build();
+```
+
+## More things
+
+![Desc][png_1]
+
+```java
+arcMenu = new ArcMenu.Builder(activity)
+        .addBtns(new ArcButton.Builder(menuBtn, 2),
+                new ArcButton.Builder(new SimpleCirView(this)
+                        .setText("2")
+                        .setCirColor(Color.parseColor("#03A9F4"))
+                        .setTextColor(Color.WHITE)
+                        .setTextSizeInSp(22)
+                        .setBackgroundRadiusInPx(22),
+                        3))
+        .setListener(MainActivity.this)
+        .showOnLongClick(btn1)
+        .setDegree(160)
+        .setRadius(222)
+        .build();
+        
+arcMenu.showOn(view); //Show Manually
+```
+
+# LICENSE
+
+```
+Copyright (C) 2016 Ding Wenhao
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+```
+
+[demo_gif]: https://github.com/HackPlan/AndroidArcMenu/raw/master/art/demo.gif
+[png_1]: https://github.com/HackPlan/AndroidArcMenu/raw/master/art/1.png
+[demo_app]: https://play.google.com/store/apps/details?id=com.hackplan.androidarcmenu.demo
+[googleplay_store_badge]: http://www.android.com/images/brand/get_it_on_play_logo_large.png
+[demo_apk]:https://github.com/HackPlan/AndroidArcMenu/raw/master/library/demo.apk