init: add contract definitions and database schema with migrations skeleton

backend/src/main/resources/application.conf.example

@@ -0,0 +1,16 @@
+ktor {
+  host = "0.0.0.0"
+  port = 8080
+}
+
+app {
+  name = "iot-backend"
+}
+
+api {
+  prefix = "/api/v1"
+}
+
+ws {
+  path = "/ws"
+}

backend/src/main/resources/application.yaml.example

@@ -0,0 +1,12 @@
+ktor:
+  host: 0.0.0.0
+  port: 8080
+
+app:
+  name: iot-backend
+
+api:
+  prefix: /api/v1
+
+ws:
+  path: /ws