bootstrap axum app, handle POST requests

This is an initial API that
- takes updates as per what foodoord sends
- outputs the current status
- persists the status in a file

Cargo.toml

@@ -4,7 +4,9 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
+axum = { version = "0.7.5" }
 serde = "1.0.202"
 serde_derive = "1.0.202"
 serde_json = "1.0.117"
 spaceapi = "0.9.0"
+tokio = { version = "1.37.0", features = ["rt-multi-thread"] }