Initial commit

This initial version is purposely extremily limited:
* `GET /ahoy` endpoint, just to check the server is alive
* `GET /items` endpoint, always returns the same item
* `POST items` endpoint, checks and print request payload, no
  persistance
* calling any other route defaults to a 404

.gitignore

@@ -0,0 +1,13 @@
+/target
+/classes
+/checkouts
+profiles.clj
+pom.xml
+pom.xml.asc
+*.jar
+*.class
+/.clj-kondo
+/.lein-*
+/.lsp
+/.nrepl-port
+/.prepl-port