Added queries implementation guide #12

	# This workflow will do a clean installation of node dependencies, cache/restore them, build the source code and run tests across different versions of node
	# For more information see: https://help.github.com/actions/language-and-framework-guides/using-nodejs-with-github-actions

	name: NodeJS CI with PostgreSQL

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	jobs:
	build:

	runs-on: ubuntu-latest

	strategy:
	matrix:
	node-version: [16.x, 18.x]
	# See supported Node.js release schedule at https://nodejs.org/en/about/releases/
	services:
	postgres:
	image: postgres:latest
	env:
	POSTGRES_USER: gh
	POSTGRES_PASSWORD: gh123
	POSTGRES_DB: mango_db
	ports:
	- 5432:5432
	# Set health checks to wait until postgres has started
	options: >-
	--health-cmd pg_isready
	--health-interval 10s
	--health-timeout 5s
	--health-retries 5

	steps:
	- uses: actions/checkout@v3
	- name: Install dependencies
	run: npm install
	- name: create postgresql tables
	run: PGPASSWORD=gh123 psql -h localhost -U gh -d mango_db -a -f ./sql/tables.sql
	- name: run tests with postgresql
	run:
	npm test
	env:
	DATABASE_URL: postgres://gh:gh123@localhost:5432/mango_db

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