refactor: move HarmonyOS project files from harmony/ to branch root

entry/src/main/ets/pages/GraphPage.ets

@@ -0,0 +1,22 @@
+import web_webview from '@ohos.web.webview';
+import { GraphDatabase } from '../model/GraphDatabase';
+
+@Component
+export struct GraphPage {
+    private controller: web_webview.WebviewController = new web_webview.WebviewController();
+    @Prop db: GraphDatabase;
+
+    build() {
+        Column() {
+            Web({ src: $rawfile('graph.html'), controller: this.controller })
+                .javaScriptAccess(true)
+                .width('100%')
+                .height('100%')
+        }
+        .width('100%')
+        .height('100%')
+        .onAppear(() => {
+            this.controller.refresh();
+        })
+    }
+}