⚡ Adds basic structure

backend/src/models/mod.rs

@@ -0,0 +1,16 @@
+use diesel::PgConnection;
+use std::sync::{Arc, Mutex};
+
+mod action;
+
+pub struct AppState {
+    pub db: Arc<Mutex<PgConnection>>,
+}
+
+impl AppState {
+    pub fn new(db: PgConnection) -> Self {
+        Self {
+            db: Arc::new(Mutex::new(db)),
+        }
+    }
+}