init service: base structure, some api-methods, migrations

src/test/kotlin/com/example/demo/DemoApplicationTests.kt

@@ -0,0 +1,13 @@
+package com.example.demo
+
+import org.junit.jupiter.api.Test
+import org.springframework.boot.test.context.SpringBootTest
+
+@SpringBootTest
+class DemoApplicationTests {
+
+	@Test
+	fun contextLoads() {
+	}
+
+}