Set proper price placeholder value into Add web form

Signed-off-by: Pekka Helenius <fincer89@hotmail.com>

bookstore/src/main/resources/templates/bookadd.html

@@ -66,7 +66,7 @@
     				 <div class="input-group-prepend">
     				 	<div class="input-group-text" th:text="#{page.symbols.currency}"></div>
     				 </div>
-    				<input class="form-control" type="text" th:field="*{price}" placeholder="Book price"/>
+    				<input class="form-control" type="text" th:field="*{price}" placeholder="0.00"/>
     			</div>
     			<small class="form-text text-muted" th:text="#{book.desc.set.price}"></small>