Add nonblocking/asyn I/O operations

README.md

@@ -55,7 +55,13 @@ EOF
 
 Replace placeholder values with your actual keys and database credentials.
 
-### 3. Set up the database
+### 3. Set up/run the database
+
+Start DB  for local development (assumes local dev env MacOS and Homebrew installed)
+
+```bash
+brew services start postgresql@15
+```
 
 Create a PostgreSQL database for the project: