Move all samples to the root dir

Signed-off-by: Anca Iordache <anca.iordache@docker.com>

react-java-mysql/backend/src/main/java/com/company/project/Application.java

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+package com.company.project;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.ComponentScan;
+
+@SpringBootApplication
+@EnableAutoConfiguration
+@ComponentScan(basePackages = {"com.company.project"})
+public class Application {
+
+    public static void main(String[] args) {
+        SpringApplication.run(Application.class, args);
+    }
+}

react-java-mysql/backend/src/main/java/com/company/project/controllers/HomeController.java

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+package com.company.project.controllers;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+
+@Controller
+public class HomeController {
+
+    @GetMapping("/")
+    public String showHome(String name, Model model) {
+        return "home";
+    }
+
+}