Move all samples to the root dir

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

spring-postgres/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);
+    }
+}

spring-postgres/backend/src/main/java/com/company/project/controllers/HomeController.java

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+package com.company.project.controllers;
+
+import com.company.project.entity.Greeting;
+import com.company.project.repository.GreetingRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.GetMapping;
+
+@Controller
+public class HomeController {
+
+    @Autowired
+    private GreetingRepository repository;
+
+    @GetMapping("/")
+    public String showHome(String name, Model model) {
+        Greeting dockerGreeting = repository.findById(1).orElse(new Greeting("Not Found 😕"));
+        model = model.addAttribute("name", dockerGreeting.getName());
+        return "home";
+    }
+
+}

spring-postgres/backend/src/main/java/com/company/project/entity/Greeting.java

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+package com.company.project.entity;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.Table;
+
+@Entity
+@Table(name = "GREETINGS")
+public class Greeting {
+
+    @Id
+    private int id;
+    private String name;
+
+    public Greeting() {
+    }
+
+    public Greeting(String name) {
+        this.name = name;
+    }
+
+    public Greeting(int id, String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        Greeting greeting = (Greeting) o;
+
+        return name.equals(greeting.name);
+    }
+
+    @Override
+    public int hashCode() {
+        return name.hashCode();
+    }
+}

spring-postgres/backend/src/main/java/com/company/project/repository/GreetingRepository.java

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+package com.company.project.repository;
+
+import com.company.project.entity.Greeting;
+import org.springframework.data.repository.CrudRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface GreetingRepository extends CrudRepository<Greeting, Integer> {
+}