Add initial JSON data files and implement core page components for game functionality

app/ViewModel/useMapViewModel.js

@@ -0,0 +1,30 @@
+import { useEffect, useState } from 'react';
+import { getMapPoints } from '../API/API';
+import { getSession } from '../Model/SessionStore';
+
+const useMapViewModel = (groupId = null) => {
+  const [points, setPoints] = useState([]);
+  const { currentGid, currentSGid } = getSession();
+  const resolvedGid = groupId ?? currentGid;
+
+  useEffect(() => {
+    if (!resolvedGid) {
+      setPoints([]);
+      return;
+    }
+    let active = true;
+    getMapPoints(resolvedGid, currentSGid).then((payload) => {
+      if (active) {
+        setPoints(payload);
+      }
+    });
+    return () => {
+      active = false;
+    };
+  }, [resolvedGid, currentSGid]);
+
+  return { points };
+};
+
+export default useMapViewModel;
+