add creation refresh token

src/core/settings.py

@@ -40,10 +40,18 @@ class AccessToken(BaseSettings):
     token_type: str = "bearer"  # noqa: S105
 
 
+class RefreshToken(BaseSettings):
+    model_config = SettingsConfigDict(
+        env_file=".env", env_file_encoding="utf-8", env_prefix="REFRESH_TOKEN_"
+    )
+    secret_key: str
+
+
 class Settings(BaseSettings):
     api: ApiPrefix = ApiPrefix()
     db: DbSettings = DbSettings()
     access_token: AccessToken = AccessToken()  # type: ignore
+    refresh_token: RefreshToken = RefreshToken()  # type: ignore
 
 
 settings = Settings()