Add events

frontend/src/api/challenges.ts

@@ -0,0 +1,9 @@
+import client from './client'
+import type { Challenge } from '@/types'
+
+export const challengesApi = {
+  list: async (marathonId: number): Promise<Challenge[]> => {
+    const response = await client.get<Challenge[]>(`/marathons/${marathonId}/challenges`)
+    return response.data
+  },
+}