Create tech stack docs (techstack.yml and techstack.md)

[stack-file]

Adding tech stack documentation to allow anyone to easily see what is being used in this repo without digging through config files. Two files are being added: techstack.yml and techstack.md. techstack.yml contains data on all the technologies being used in this repo. techstack.md is a visualization of the YML file and displays the tech stack data in a pretty Markdown file.

💡 Protip: techstack.md contains a comment at the top of the file that the following README snippet (with and without the logos) at the top of the file as a comment:

<--- Readme.md Snippet without images Start --->

Tech Stack

Xcov19/registrations is built on the following main stack:

• Python – Languages
• FastAPI – Microframeworks (Backend)
• DB – Database Tools
• MongoDB – Databases
• PostgreSQL – Databases
• Docker – Virtual Machine Platforms & Containers
• GitHub Actions – Continuous Integration
• Shell – Shells

Full tech stack here

<--- Readme.md Snippet without images End --->

Get the code:

## Tech Stack
Xcov19/registrations is built on the following main stack:

- [Python](https://www.python.org) – Languages
- [FastAPI](https://fastapi.tiangolo.com/) – Microframeworks (Backend)
- [DB](https://github.com/infostreams/db) – Database Tools
- [MongoDB](http://www.mongodb.com/) – Databases
- [PostgreSQL](http://www.postgresql.org/) – Databases
- [Docker](https://www.docker.com/) – Virtual Machine Platforms & Containers
- [GitHub Actions](https://github.com/features/actions) – Continuous Integration
- [Shell](https://en.wikipedia.org/wiki/Shell_script) – Shells

Full tech stack [here](/techstack.md)

---

<--- Readme.md Snippet with images Start --->

Tech Stack

Xcov19/registrations is built on the following main stack:

• Python – Languages
• FastAPI – Microframeworks (Backend)
• DB – Database Tools
• MongoDB – Databases
• PostgreSQL – Databases
• Docker – Virtual Machine Platforms & Containers
• GitHub Actions – Continuous Integration
• Shell – Shells

Full tech stack here

<--- Readme.md Snippet with images End --->

Get the code:

## Tech Stack
Xcov19/registrations is built on the following main stack:

- <img width='25' height='25' src='https://img.stackshare.io/service/993/pUBY5pVj.png' alt='Python'/> [Python](https://www.python.org) – Languages
- <img width='25' height='25' src='https://img.stackshare.io/service/25014/default_f6ff39141b468e832d1bc59fc98a060df604d44d.png' alt='FastAPI'/> [FastAPI](https://fastapi.tiangolo.com/) – Microframeworks (Backend)
- <img width='25' height='25' src='https://img.stackshare.io/service/11593/no-img.png' alt='DB'/> [DB](https://github.com/infostreams/db) – Database Tools
- <img width='25' height='25' src='https://img.stackshare.io/service/1030/leaf-360x360.png' alt='MongoDB'/> [MongoDB](http://www.mongodb.com/) – Databases
- <img width='25' height='25' src='https://img.stackshare.io/service/1028/ASOhU5xJ.png' alt='PostgreSQL'/> [PostgreSQL](http://www.postgresql.org/) – Databases
- <img width='25' height='25' src='https://img.stackshare.io/service/586/n4u37v9t_400x400.png' alt='Docker'/> [Docker](https://www.docker.com/) – Virtual Machine Platforms & Containers
- <img width='25' height='25' src='https://img.stackshare.io/service/11563/actions.png' alt='GitHub Actions'/> [GitHub Actions](https://github.com/features/actions) – Continuous Integration
- <img width='25' height='25' src='https://img.stackshare.io/service/4631/default_c2062d40130562bdc836c13dbca02d318205a962.png' alt='Shell'/> [Shell](https://en.wikipedia.org/wiki/Shell_script) – Shells

Full tech stack [here](/techstack.md)