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

freeCodeCamp/devdocs is built on the following main stack:

• New Relic – Performance Monitoring
• Ruby – Languages
• Sinatra – Microframeworks (Backend)
• JavaScript – Languages
• Capybara – Testing Frameworks
• GitHub Actions – Continuous Integration
• Docker – Virtual Machine Platforms & Containers

Full tech stack here

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

Get the code:

## Tech Stack
freeCodeCamp/devdocs is built on the following main stack:

- [New Relic](http://newrelic.com) – Performance Monitoring
- [Ruby](https://www.ruby-lang.org) – Languages
- [Sinatra](http://www.sinatrarb.com/) – Microframeworks (Backend)
- [JavaScript](https://developer.mozilla.org/en-US/docs/Web/JavaScript) – Languages
- [Capybara](http://jnicklas.github.io/capybara/) – Testing Frameworks
- [GitHub Actions](https://github.com/features/actions) – Continuous Integration
- [Docker](https://www.docker.com/) – Virtual Machine Platforms & Containers

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

---

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

Tech Stack

freeCodeCamp/devdocs is built on the following main stack:

• New Relic – Performance Monitoring
• Ruby – Languages
• Sinatra – Microframeworks (Backend)
• JavaScript – Languages
• Capybara – Testing Frameworks
• GitHub Actions – Continuous Integration
• Docker – Virtual Machine Platforms & Containers

Full tech stack here

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

Get the code:

## Tech Stack
freeCodeCamp/devdocs is built on the following main stack:

- <img width='25' height='25' src='https://img.stackshare.io/service/103/default_193410db3a7e419c7b436961bf41d733c7346b59.png' alt='New Relic'/> [New Relic](http://newrelic.com) – Performance Monitoring
- <img width='25' height='25' src='https://img.stackshare.io/service/989/ruby.png' alt='Ruby'/> [Ruby](https://www.ruby-lang.org) – Languages
- <img width='25' height='25' src='https://img.stackshare.io/service/999/logo.png' alt='Sinatra'/> [Sinatra](http://www.sinatrarb.com/) – Microframeworks (Backend)
- <img width='25' height='25' src='https://img.stackshare.io/service/1209/javascript.jpeg' alt='JavaScript'/> [JavaScript](https://developer.mozilla.org/en-US/docs/Web/JavaScript) – Languages
- <img width='25' height='25' src='https://img.stackshare.io/service/2595/capybara.png' alt='Capybara'/> [Capybara](http://jnicklas.github.io/capybara/) – Testing Frameworks
- <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/586/n4u37v9t_400x400.png' alt='Docker'/> [Docker](https://www.docker.com/) – Virtual Machine Platforms & Containers

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