Create basic couple route

geneit_app/src/widgets/CouplePhoto.tsx

@@ -0,0 +1,19 @@
+import { Avatar } from "@mui/material";
+import { Couple } from "../api/CoupleApi";
+
+export function CouplePhoto(p: {
+  couple: Couple;
+  width?: number;
+}): React.ReactElement {
+  return (
+    <Avatar
+      sx={
+        p.width
+          ? { width: `${p.width}px`, height: "auto", display: "inline-block" }
+          : undefined
+      }
+      variant="rounded"
+      src={p.couple.thumbnailURL ?? undefined}
+    />
+  );
+}