Added backend and fixed openapi generation

backend/src/test/java/com/alttd/altitudeweb/AltitudeWebApplicationTests.java

@@ -0,0 +1,13 @@
+package com.alttd.altitudeweb;
+
+//import org.junit.jupiter.api.Test;
+//import org.springframework.boot.test.context.SpringBootTest;
+//
+//@SpringBootTest
+//class AltitudeWebApplicationTests {
+//
+//    @Test
+//    void contextLoads() {
+//    }
+//
+//}