New UI (#157, #164)

- Add a react UI to replace the plain HTML one. 
- Serve as a foundation for better GUI interactions

ui/tsconfig.json

@@ -0,0 +1,7 @@
+{
+  "files": [],
+  "references": [
+    { "path": "./tsconfig.app.json" },
+    { "path": "./tsconfig.node.json" }
+  ]
+}