initial setup of dev/prod envs

.env.dev-sample

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+FLASK_ENV=development
+FLASK_APP=forest/__init__.py
+APP_FOLDER=/usr/src/app
+
+SQL_HOST=db
+SQL_PORT=5432
+DATABASE=postgres
+
+POSTGRES_USER=forest
+POSTGRES_PASSWORD=forest123
+POSTGRES_DB=forest_dev
+
+DATABASE_URL=postgresql://forest:forest123@db:5432/forest_dev
+

.env.prod-sample

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+FLASK_ENV=production
+FLASK_APP=project/__init__.py
+APP_FOLDER=/home/app/web
+
+SQL_HOST=db
+SQL_PORT=5432
+DATABASE=postgres
+
+POSTGRES_USER=forest
+POSTGRES_PASSWORD=forest123
+POSTGRES_DB=forest_prod
+
+DATABASE_URL=postgresql://forest:forest123@db:5432/forest_prod
+

.gitignore

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+*.pyc
+__pycache
+.DS_Store
+.env.dev
+.env.prod

README.md

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+### Development
+
+Uses the default Flask development server.
+
+1. Rename *.env.dev-sample* to *.env.dev*.
+1. Update the environment variables in the *docker-compose.yml* and *.env.dev* files.
+    - (M1 chip only) Remove `-slim-buster` from the Python dependency in `services/web/Dockerfile` to suppress an issue with installing psycopg2
+1. Build the images and run the containers:
+
+    ```sh
+    $ docker-compose up -d --build
+    ```
+
+    Test it out at [http://localhost:5000](http://localhost:5000). The "web" folder is mounted into the container and your code changes apply automatically.
+
+### Production
+
+Uses gunicorn + nginx.
+
+1. Rename *.env.prod-sample* to *.env.prod* and *.env.prod.db-sample* to *.env.prod.db*. Update the environment variables.
+1. Build the images and run the containers:
+
+    ```sh
+    $ docker-compose -f docker-compose.prod.yml up -d --build
+    ```
+
+    Test it out at [http://localhost:1337](http://localhost:1337). No mounted folders. To apply changes, the image must be re-built.
+
+### More info:
+Check out the [post](https://testdriven.io/blog/dockerizing-flask-with-postgres-gunicorn-and-nginx).
+