Add install instructions

fixes #126

ENV_TEMPLATE.md

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+## How to use
+
+1. Create a new `.env` file
+2. Paste the contents from the `Environment variables` section below
+3. Edit the required values
+
+## Environment variables
+
+```
+DATABASE_URL="postgresql://forent:password@localhost:5432/forent?schema=public"
+
+# Read more at https://next-auth.js.org/configuration/options#nextauth_secret
+NEXTAUTH_SECRET=
+NEXTAUTH_URL="http://localhost:3000"
+
+# Read more at https://next-auth.js.org/providers/email
+EMAIL_SERVER_HOST=
+EMAIL_SERVER_PORT=
+EMAIL_SERVER_USER=
+EMAIL_SERVER_PASSWORD=
+EMAIL_FROM=
+
+# Read more at
+# https://next-auth.js.org/providers/google
+# https://developers.google.com/identity/protocols/oauth2
+GOOGLE_CLIENT_ID=
+GOOGLE_CLIENT_SECRET=
+GOOGLE_REFRESH_TOKEN=
+
+# (Optional)
+# Read more at https://www.chromatic.com/docs/cli/
+CHROMATIC_PROJECT_TOKEN=
+
+
+## NOTICE
+# The values below can be left as-is. 
+# However, you can edit any of them to customize this application's behavior.
+## NOTICE
+
+
+# Reverse geocoding
+GEOCODE_URL_GEONAMES="http://api.3geonames.org/lat,lon.json"
+
+# Listing image dimensions
+LISTING_CARD_PHOTO_WIDTH=300
+LISTING_CARD_PHOTO_HEIGHT=300
+
+LISTING_COVER_PHOTO_WIDTH=800
+LISTING_COVER_PHOTO_HEIGHT=600
+
+LISTING_FULL_PHOTO_WIDTH=1600
+LISTING_FULL_PHOTO_HEIGHT=900
+
+# Listing min-max values
+LISTING_PRICE_MIN=100
+LISTING_PRICE_MAX=100_000_000
+
+LISTING_DEPOSIT_MIN=0
+LISTING_DEPOSIT_MAX=1_000_000
+
+LISTING_DESC_MIN=16
+LISTING_DESC_MAX=1024
+
+LISTING_BEDS_MIN=1
+LISTING_BEDS_MAX=750
+
+LISTING_BATHS_MIN=1
+LISTING_BATHS_MAX=250
+
+LISTING_AREA_MIN=10
+LISTING_AREA_MAX=1_000_000
+
+LISTING_ADDRESS_LINE_MIN=1
+LISTING_ADDRESS_LINE_MAX=128
+
+LISTING_ADDRESS_CITY_MIN=1
+LISTING_ADDRESS_CITY_MAX=64
+
+LISTING_ADDRESS_STATE_MIN=1
+LISTING_ADDRESS_STATE_MAX=64
+
+LISTING_ADDRESS_ZIP_MIN=0
+LISTING_ADDRESS_ZIP_MAX=64
+
+LISTING_ADDRESS_LON_MIN=-180
+LISTING_ADDRESS_LON_MAX=180
+
+LISTING_ADDRESS_LAT_MIN=-90
+LISTING_ADDRESS_LAT_MAX=90
+```

SETUP.md

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+## Requirement
+
+1. Running PostgreSQL server
+
+## Steps
+
+1. Install packages `npm ci`
+2. Build the application `npm build`
+3. Start the server in production mode `npm start`
+
+Alternatives are listed in the [official Next.js docs](https://nextjs.org/docs/app/building-your-application/deploying)
+
+## Docker
+
+Docker is not compatible with this project since Prisma, the database client, is encountering this error.
+
+```
+21.88 error: Environment variable not found: DATABASE_URL.
+21.88   -->  schema.prisma:8
+21.88    |
+21.88  7 |   provider = "postgresql"
+21.88  8 |   url      = env("DATABASE_URL")
+21.88    |
+```
+
+I have tried the following yet the same error persists:
+
+1. [`docker compose run -e`](https://docs.docker.com/compose/environment-variables/set-environment-variables/#set-environment-variables-with-docker-compose-run---env)
+2. [`env_file`](https://docs.docker.com/compose/environment-variables/set-environment-variables/#use-the-env_file-attribute)
+3. [`environment`](https://docs.docker.com/compose/environment-variables/set-environment-variables/#use-the-env_file-attribute)