add post repository

Author: Javad Bagirov

src/main/java/org/blog/app/repository/PostRepository.java

@@ -0,0 +1,6 @@
+package org.blog.app.repository;
+
+import org.blog.app.domain.Post;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface PostRepository extends JpaRepository<Post, Long> { }