added write sdcard permission to app

Author: hiteshsondhi88

app/src/main/AndroidManifest.xml

@@ -2,6 +2,8 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.github.hiteshsondhi88.sampleffmpeg" >
 
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+
     <application
         android:allowBackup="true"
         android:icon="@drawable/ic_launcher"