add debug bottom sheet

Android/app/src/main/java/pub/doric/demo/MainActivity.java

@@ -15,22 +15,26 @@
  */
 package pub.doric.demo;
 
-import androidx.appcompat.app.AppCompatActivity;
-
 import android.os.Bundle;
+import android.view.KeyEvent;
 import android.view.ViewGroup;
 import android.widget.FrameLayout;
 
+import androidx.appcompat.app.AppCompatActivity;
+
+import java.io.IOException;
+
+import pub.doric.DevPanel;
 import pub.doric.Doric;
 import pub.doric.DoricContext;
 import pub.doric.dev.LocalServer;
 import pub.doric.utils.DoricUtils;
 
-import java.io.IOException;
-
 
 public class MainActivity extends AppCompatActivity {
 
+    private DevPanel mDevPanel = new DevPanel();
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -47,4 +51,12 @@ public class MainActivity extends AppCompatActivity {
             e.printStackTrace();
         }
     }
+
+    @Override
+    public boolean onKeyDown(int keyCode, KeyEvent event) {
+        if (KeyEvent.KEYCODE_MENU == event.getKeyCode()) {
+            mDevPanel.show(getSupportFragmentManager(), "DevPanel");
+        }
+        return super.onKeyDown(keyCode, event);
+    }
 }

Android/app/src/main/res/layout/activity_main.xml

@@ -3,7 +3,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    tools:context="com.github.penfeizhou.doricdemo.pub.doric.demo.MainActivity">
+    tools:context=".MainActivity">
 
     <FrameLayout
         android:id="@+id/root"