added get and create posts with back

src/hooks/useCreatePost.js

@@ -0,0 +1,42 @@
+import { useState } from "react";
+import { API_URL } from "../config/constants";
+
+export function useCreatePost() {
+  const [loading, setLoading] = useState(false);
+  const [error,   setError]   = useState(null);
+  const [success, setSuccess] = useState(false);
+
+  const createAd = async (adData) => {
+    setLoading(true);
+    setError(null);
+
+    try {
+      const token = localStorage.getItem("token");
+
+      const res = await fetch(`${API_URL}/api/v1/posts`, {
+        method: "POST",
+        headers: {
+          "Content-Type": "application/json",
+          "Authorization": `Bearer ${token}`,
+        },
+        body: JSON.stringify(adData),
+      });
+
+      const data = await res.json();
+
+      if (!res.ok) {
+        throw new Error(data.message || "Ошибка при создании объявления");
+      }
+
+      setSuccess(true);
+      return data; // возвращает созданное объявление
+    } catch (e) {
+      setError(e.message);
+      return null;
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  return { createAd, loading, error, success };
+}