Environment (#3)

Reviewed-on: #3
Co-authored-by: kdeng00 <kundeng00@pm.me>
Co-committed-by: kdeng00 <kundeng00@pm.me>

src/keys.rs

@@ -0,0 +1,5 @@
+pub const DBURL: &str = "DATABASE_URL";
+
+pub mod error {
+    pub const ERROR: &str = "DATABASE_URL must be set in .env";
+}