add shader plugin

Android/app/src/main/java/com/github/penfeizhou/doricdemo/MainActivity.java

@@ -5,6 +5,7 @@ import android.os.Bundle;
 
 import com.github.penfeizhou.doric.DoricContext;
 import com.github.penfeizhou.doric.utils.DoricUtils;
+import com.github.pengfeizhou.jscore.JSONBuilder;
 
 public class MainActivity extends AppCompatActivity {
 
@@ -13,6 +14,7 @@ public class MainActivity extends AppCompatActivity {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         DoricContext doricContext = DoricContext.create(this, DoricUtils.readAssetFile("demo.js"), "demo");
+        doricContext.callEntity("__init__", new JSONBuilder().put("width", 100).put("height", 100));
         doricContext.callEntity("log");
     }
 }