add health controller

src/main/java/com/project/carsharingapp/controller/HealthController.java

@@ -0,0 +1,17 @@
+package com.project.carsharingapp.controller;
+
+import io.swagger.v3.oas.annotations.tags.Tag;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@Tag(name = "Health management",
+        description = "Send message if application is running")
+@RestController
+@RequestMapping(value = "/health")
+public class HealthController {
+    @GetMapping
+    public String checkHealth() {
+        return "Application is up and running";
+    }
+}