added source for 'A Guide to Spring Boot in Eclipse'

spring-boot/src/main/java/org/baeldung/boot/DemoApplication.java

@@ -0,0 +1,13 @@
+package org.baeldung.boot;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class DemoApplication {
+
+	public static void main(String[] args) {
+		System.setProperty("spring.config.name", "demo");
+		SpringApplication.run(DemoApplication.class, args);
+	}
+}

spring-boot/src/main/java/org/baeldung/boot/model/Foo.java

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+package org.baeldung.boot.model;
+
+import java.io.Serializable;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+
+@Entity
+public class Foo implements Serializable {
+	private static final long serialVersionUID = 1L;
+	@Id
+	@GeneratedValue
+	private Integer id;
+	private String name;
+
+	public Foo() {
+	}
+
+	public Foo(String name) {
+		this.name = name;
+	}
+
+	public Integer getId() {
+		return id;
+	}
+
+	public void setId(Integer id) {
+		this.id = id;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+}

spring-boot/src/main/java/org/baeldung/boot/repository/FooRepository.java

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+package org.baeldung.boot.repository;
+
+import org.baeldung.boot.model.Foo;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface FooRepository extends JpaRepository<Foo, Integer> {
+	public Foo findByName(String name);
+}