add asset js loader & export doric classes

doric-Qt/example/doric/loader/DoricAssetJSLoader.cpp

@@ -0,0 +1,19 @@
+#include "DoricAssetJSLoader.h"
+
+#include "utils/DoricUtils.h"
+
+DoricAssetJSLoader::DoricAssetJSLoader() {}
+
+bool DoricAssetJSLoader::filter(QString source) {
+  return source.startsWith("assets");
+}
+
+std::shared_ptr<DoricAsyncResult> DoricAssetJSLoader::request(QString source) {
+  QString protocol = "assets://";
+  QString assetPath = source.mid(protocol.length());
+
+  std::shared_ptr<DoricAsyncResult> asyncResult =
+      std::make_shared<DoricAsyncResult>();
+
+  return asyncResult;
+}