Allows Android applications to open network sockets: "android.permission.INTERNET"

If your Android application need to access Internet, you have to grand permission to open network sockets.

Add the code in AndroidManifest.xml,

      package="com.exercise.AndroidTwitterClient"
      android:versionCode="1"
      android:versionName="1.0">
    
                          android:label="@string/app_name">