added initial spring boot setup with external postgres connection and openai api key

backend/src/main/java/com/vaessl/app/Application.java

@@ -0,0 +1,13 @@
+package com.vaessl.app;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Application {
+
+	public static void main(String[] args) {
+		SpringApplication.run(Application.class, args);
+	}
+
+}