BAEL-1623 sample spring boot gradle project

spring-boot-gradle/src/main/java/org/baeldung/AlternateEntryPoint.java

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+package org.baeldung;
+
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class AlternateEntryPoint {
+
+    public static void main(String[] args) {
+        System.out.println("Alternate main class triggered");
+    }
+}

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

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+package org.baeldung;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class DemoApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(DemoApplication.class, args);
+    }
+}