Initial draft of Simple UI (#1499)

A very simple UI based on Vaadin 24.

hawkbit-runtime/hawkbit-simple-ui/src/main/resources/application.properties

@@ -0,0 +1,24 @@
+#
+# Copyright (c) 2023 Contributors to the Eclipse Foundation
+#
+# This program and the accompanying materials are made
+# available under the terms of the Eclipse Public License 2.0
+# which is available at https://www.eclipse.org/legal/epl-2.0/
+#
+# SPDX-License-Identifier: EPL-2.0
+#
+
+server.port=${PORT:8088}
+spring.cloud.openfeign.httpclient.hc5.enabled=true
+
+### Vaadin start ###`
+# build with mvn vaadin:build-frontend to enable / disable
+vaadin.frontend.hotdeploy=false
+logging.level.org.atmosphere = warn
+spring.mustache.check-template-location = false
+# Launch the default browser when starting the application in development mode
+vaadin.launch-browser=true
+# To improve the performance during development.
+# For more information https://vaadin.com/docs/flow/spring/tutorial-spring-configuration.html#special-configuration-parameters
+vaadin.whitelisted-packages = com.vaadin,org.vaadin,dev.hilla,com.eclipse.hawkbit
+### Vaadin end ###

hawkbit-runtime/hawkbit-simple-ui/src/main/resources/banner.txt

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+______     _ _                  _                    _    ____  _ _   
+|  ____|   | (_)                | |                  | |  |  _ \(_) |  
+| |__   ___| |_ _ __  ___  ___  | |__   __ ___      _| | _| |_) |_| |_ 
+|  __| / __| | | '_ \/ __|/ _ \ | '_ \ / _` \ \ /\ / / |/ /  _ <| | __|
+| |___| (__| | | |_) \__ \  __/ | | | | (_| |\ V  V /|   <| |_) | | |_ 
+|______\___|_|_| .__/|___/\___|_|_| |_|\__,_|_\_/\_/ |_|\_\____/|_|\__|
+   / ____(_)| |            | |      | |  | |_   _|                  
+  | (___  _ |_|_ ___  _ __ | | ___  | |  | | | |                    
+   \___ \| | '_ ` _ \| '_ \| |/ _ \ | |  | | | |                    
+   ____) | | | | | | | |_) | |  __/ | |__| |_| |_                   
+  |_____/|_|_| |_| |_| .__/|_|\___|  \____/|_____|                  
+					 | |                                            
+					 |_|                     
+
+Eclipse hawkBit UI ${application.formatted-version}
+using Spring Boot ${spring-boot.formatted-version}
+
+Go to https://www.eclipse.org/hawkbit for more information.