➕ add Spring Security dependency for #14 #15 #19

Signed-off-by: Marcus Fihlon <marcus@fihlon.swiss>

pom.xml

@@ -143,6 +143,10 @@
             <groupId>com.vaadin</groupId>
             <artifactId>vaadin-spring-boot-starter</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-security</artifactId>
+        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-validation</artifactId>