feat(frontend): Added functionality to the frontend to log in.

frontend/src/services/api-client.ts

@@ -0,0 +1,10 @@
+import axios from "axios";
+
+const apiClient = axios.create({
+    baseURL: window.location.hostname == "localhost" ? "http://localhost:3000" : window.location.origin,
+    headers: {
+        "Content-Type": "application/json",
+    },
+});
+
+export default apiClient;