docs: adds step to start database in README (#805)

Signed-off-by: Anthony D. Mays <anthony@morganlatimer.com>

Author: anthonydmays

lib/javascript/fullstack_demo/.env.example.postgres

@@ -2,5 +2,5 @@ NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY=Your Next Public Clerk Publishable Key here
 CLERK_SECRET_KEY=Your Clerk Secret Key here
 DB_TYPE=postgres
 NEXT_PUBLIC_API_URL=http://localhost:3000
-DATABASE_URL=Your Postgres connection pooling database URL
-DIRECT_URL=Your Postgres direct database URL
+DATABASE_URL=postgresql://postgres:password@localhost:5432/fullstack_db
+DIRECT_URL=postgresql://postgres:password@localhost:5432/fullstack_db

lib/javascript/fullstack_demo/README.md

@@ -6,10 +6,11 @@ This project demonstrates a fully working task management app built using NextJS
 
 ## Running the app
 
-To run the app, copy the [.env.example](./.env.example) file as `.env` and setup the Clerk keys by setting up an account at https://clerk.dev. Once done, you can start up the local dev server with the following commands:
+To run the app, copy the [.env.example.postgres](./.env.example.postgres) file as `.env` and setup the Clerk keys by setting up an account at https://clerk.dev. Once done, you can start up the local dev server with the following commands:
 
 ```bash
 npm install
+npm run db:start
 npm run dev
 ```