feat: openapi with swagger ui

closes #188

Author: mightyiam

Cargo.lock

@@ -37,6 +37,9 @@ Expects [configuration via environment](https://molybdenumsoftware.github.io/pr-
 Takes no arguments.
 Expects [configuration via environment](https://molybdenumsoftware.github.io/pr-tracker/programs/pr_tracker_api_config/struct.Environment.html).
 
+- `/openapi.json`
+- `/` redirects to API documentation
+
 ## NixOS modules
 
 [Manual](https://molybdenumsoftware.github.io/pr-tracker/nixos-modules)

README.md

@@ -1,6 +1,7 @@
 [dependencies]
 camino = "*"
 poem = {features = ["test"], version = "*"}
+poem-openapi = {features = ["swagger-ui"], version = "*"}
 pr-tracker-api-config = {path = "../api-config"}
 sqlx = {default-features = false, features = ["macros", "migrate"], version = "*"}
 tokio = "*"