made player pause when screen is locked. started creating audiosupport

app/src/main/java/org/schabi/newpipe/PlayVideoActivity.java

@@ -153,6 +153,17 @@ public class PlayVideoActivity extends AppCompatActivity {
         return true;
     }
 
+    @Override
+    public void onResume() {
+        super.onResume();
+    }
+
+    @Override
+    public void onPause() {
+        super.onPause();
+        videoView.pause();
+    }
+
     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
         int id = item.getItemId();