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

[stack-file[bot]]

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

guibranco/holiday-api-rust is built on the following main stack:

• Rust – Languages
• GitHub Actions – Continuous Integration
• Shell – Shells

Full tech stack here

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

Get the code:

## Tech Stack
guibranco/holiday-api-rust is built on the following main stack:

- [Rust](http://www.rust-lang.org/) – Languages
- [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

guibranco/holiday-api-rust is built on the following main stack:

• Rust – Languages
• GitHub Actions – Continuous Integration
• Shell – Shells

Full tech stack here

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

Get the code:

## Tech Stack
guibranco/holiday-api-rust is built on the following main stack:

- <img width='25' height='25' src='https://img.stackshare.io/service/1070/v7txhrjp9pdqrkdtxxp0.png' alt='Rust'/> [Rust](http://www.rust-lang.org/) – Languages
- <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)