Set up postgres

README.md

@@ -7,6 +7,9 @@ In twilight's hush, where mythic tales unfold, A ledger of legends, the bravest
 | name                   | required | info                    |
 |------------------------|:--------:|-------------------------|
 | spring.profiles.active | ✓  | Spring Boot environment |
+| spring.r2dbc.url       | ✓  | Postgres host url       |
+| spring.r2dbc.username  | ✓  | Postgres username       |
+| spring.r2dbc.password  | ✗  | Postgres password       |
 
 *Required: ✓ can be stored as text, and ✗ need to be stored as secret.*