Added optional dual/multi window for Samsung and LG devices

Not tested, but it should work.

Clover/app/src/main/AndroidManifest.xml

@@ -31,7 +31,24 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:theme="@style/Chan.Theme">
-
+        
+        <!--Dual Window support for Samsung and LG-->
+        <meta-data
+            android:name="com.lge.support.SPLIT_WINDOW"
+            android:value="true"/>
+        <uses-library
+            android:required="false"
+            android:name="com.sec.android.app.multiwindow"/>
+        <meta-data
+            android:name="com.sec.android.support.multiwindow"
+            android:value="true"/>
+        <meta-data
+            android:name="com.sec.android.multiwindow.DEFAULT_SIZE_W"
+            android:value="632.0dip"/>
+        <meta-data
+            android:name="com.sec.android.multiwindow.DEFAULT_SIZE_H"
+            android:value="598.0dip"/>
+        
         <activity
             android:name=".ui.activity.BoardActivity"
             android:configChanges="keyboardHidden|orientation|screenSize"