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

HINTERLAND-software/lambda.mail-api is built on the following main stack:

• Jest – Javascript Testing Framework
• Node.js – Frameworks (Full Stack)
• JavaScript – Languages
• TypeScript – Languages
• Webpack – JS Build Tools / JS Task Runners
• AWS Lambda – Serverless / Task Processing
• Serverless – Serverless / Task Processing
• Prettier – Code Review
• GitHub Actions – Continuous Integration

Full tech stack here

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

Get the code:

## Tech Stack
HINTERLAND-software/lambda.mail-api is built on the following main stack:

- [Jest](http://facebook.github.io/jest/) – Javascript Testing Framework
- [Node.js](http://nodejs.org/) – Frameworks (Full Stack)
- [JavaScript](https://developer.mozilla.org/en-US/docs/Web/JavaScript) – Languages
- [TypeScript](http://www.typescriptlang.org) – Languages
- [Webpack](http://webpack.js.org) – JS Build Tools / JS Task Runners
- [AWS Lambda](http://aws.amazon.com/lambda) – Serverless / Task Processing
- [Serverless](https://github.com/serverless/serverless) – Serverless / Task Processing
- [Prettier](https://prettier.io/) – Code Review
- [GitHub Actions](https://github.com/features/actions) – Continuous Integration

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

---

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

Tech Stack

HINTERLAND-software/lambda.mail-api is built on the following main stack:

• Jest – Javascript Testing Framework
• Node.js – Frameworks (Full Stack)
• JavaScript – Languages
• TypeScript – Languages
• Webpack – JS Build Tools / JS Task Runners
• AWS Lambda – Serverless / Task Processing
• Serverless – Serverless / Task Processing
• Prettier – Code Review
• GitHub Actions – Continuous Integration

Full tech stack here

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

Get the code:

## Tech Stack
HINTERLAND-software/lambda.mail-api is built on the following main stack:

- <img width='25' height='25' src='https://img.stackshare.io/service/830/jest.png' alt='Jest'/> [Jest](http://facebook.github.io/jest/) – Javascript Testing Framework
- <img width='25' height='25' src='https://img.stackshare.io/service/1011/n1JRsFeB_400x400.png' alt='Node.js'/> [Node.js](http://nodejs.org/) – Frameworks (Full Stack)
- <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/1612/bynNY5dJ.jpg' alt='TypeScript'/> [TypeScript](http://www.typescriptlang.org) – Languages
- <img width='25' height='25' src='https://img.stackshare.io/service/1682/IMG_4636.PNG' alt='Webpack'/> [Webpack](http://webpack.js.org) – JS Build Tools / JS Task Runners
- <img width='25' height='25' src='https://img.stackshare.io/service/1909/aws-lambda.png' alt='AWS Lambda'/> [AWS Lambda](http://aws.amazon.com/lambda) – Serverless / Task Processing
- <img width='25' height='25' src='https://img.stackshare.io/service/5095/serverless-logo.png' alt='Serverless'/> [Serverless](https://github.com/serverless/serverless) – Serverless / Task Processing
- <img width='25' height='25' src='https://img.stackshare.io/service/7035/default_66f265943abed56bcdbfca1c866a4261b1fbb063.jpg' alt='Prettier'/> [Prettier](https://prettier.io/) – Code Review
- <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

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