add images

add images in header and footer

Author: donghae0414

src/main/resources/static/img/blog.jpg

@@ -1,2 +1,5 @@
 <hr>
-<h1>This is footer</h1>
+<a th:href = "@{'/'}">
+<h1>This is footer</h1>
+<img src="../img/dog.jpg" th:src="@{/img/dog.jpg}">
+</a>

src/main/resources/static/img/dog.jpg

@@ -1,3 +1,5 @@
+<a th:href = "@{'/'}">
 <h1>This is header</h1>
-<a th:href = "@{'/'}">HOME</a>
+<img src="../img/blog.jpg" th:src="@{/img/blog.jpg}">
+</a>
 <hr>