Add section about deployment with details about Heroku

Author: RadoRado

README.md

@@ -248,6 +248,44 @@ To shell
 docker-compose run django python manage.py shell
 ```
 
-## Heroku
+## Deployment
 
-The project is ready to be deployed on Heroku. There's a current deployment that can be found - <https://hacksoft-styleguide-example.herokuapp.com/>
+This project is ready to be deployed either on **Heroku** or **AWS ECS**.
+
+### Heroku
+
+Deploying a Python / Django application on Heroku is quite straighforward & this project is ready to be deployed.
+
+To get an overview of how Heroku deployment works, we recommend reading this first - <https://devcenter.heroku.com/articles/deploying-python>
+
+There's a current deployment that can be found here - <https://hacksoft-styleguide-example.herokuapp.com/>
+
+**Files related to Heroku deployment:**
+
+1. `Procfile`
+    - Comes with default `web`, `worker` and `beat` processes.
+    - Additionally, there's a `release` phase to run migrations safely, before releasing the new build.
+1. `runtime.txt`
+    - Simply specifies the Python version to be used.
+1. `requirements.txt`
+    - Heroku requires a root-level `requirements.txt`, so we've added that.
+
+**Additionally, you need to specify at least the following settings:**
+
+1. `DJANGO_SETTINGS_MODULE`, usually to `config.django.production`
+1. `SECRET_KEY` to something secret. [Check here for ideas](https://stackoverflow.com/questions/41298963/is-there-a-function-for-generating-settings-secret-key-in-django).
+1. `ALLOWED_HOSTS`, usually to the default heroku domain (for example - `hacksoft-styleguide-example.herokuapp.com`)
+
+On top of that, we've added `gunicorn.conf.py` with some example settings.
+
+**We recommend the following materials, to figure out `gunicorn` defaults and configuration:**
+
+1. <https://devcenter.heroku.com/articles/python-gunicorn>
+1. <https://adamj.eu/tech/2019/09/19/working-around-memory-leaks-in-your-django-app/>
+1. <https://adamj.eu/tech/2021/12/29/set-up-a-gunicorn-configuration-file-and-test-it/>
+1. Worker settings - <https://docs.gunicorn.org/en/latest/settings.html#worker-processes>
+1. A brief description of the architecture of Gunicorn - <https://docs.gunicorn.org/en/latest/design.html>
+
+### AWS ECS
+
+*Coming soon*