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

rimutaka/aws-lambda-rust-runtime is built on the following main stack:

• Python – Languages
• Swift – Languages
• Rust – Languages
• JavaScript – Languages
• Tower – Source Code Management Desktop Apps
• Hyper – Containers as a Service
• Serde – Serialization Frameworks
• GitHub Actions – Continuous Integration
• Tokio – Concurrency Frameworks

Full tech stack here

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

Get the code:

## Tech Stack
rimutaka/aws-lambda-rust-runtime is built on the following main stack:

- [Python](https://www.python.org) – Languages
- [Swift](https://developer.apple.com/swift/) – Languages
- [Rust](http://www.rust-lang.org/) – Languages
- [JavaScript](https://developer.mozilla.org/en-US/docs/Web/JavaScript) – Languages
- [Tower](https://www.git-tower.com/) – Source Code Management Desktop Apps
- [Hyper](https://hyper.sh/) – Containers as a Service
- [Serde](https://serde.rs) – Serialization Frameworks
- [GitHub Actions](https://github.com/features/actions) – Continuous Integration
- [Tokio](https://tokio.rs/) – Concurrency Frameworks

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

---

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

Tech Stack

rimutaka/aws-lambda-rust-runtime is built on the following main stack:

• Python – Languages
• Swift – Languages
• Rust – Languages
• JavaScript – Languages
• Tower – Source Code Management Desktop Apps
• Hyper – Containers as a Service
• Serde – Serialization Frameworks
• GitHub Actions – Continuous Integration
• Tokio – Concurrency Frameworks

Full tech stack here

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

Get the code:

## Tech Stack
rimutaka/aws-lambda-rust-runtime 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/1009/tuHsaI2U.png' alt='Swift'/> [Swift](https://developer.apple.com/swift/) – Languages
- <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/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/1601/tower-dock-icon_transparent_2x.png' alt='Tower'/> [Tower](https://www.git-tower.com/) – Source Code Management Desktop Apps
- <img width='25' height='25' src='https://img.stackshare.io/service/3125/xSVaubUG_400x400.jpg' alt='Hyper'/> [Hyper](https://hyper.sh/) – Containers as a Service
- <img width='25' height='25' src='https://img.stackshare.io/service/11028/no-img-open-source.png' alt='Serde'/> [Serde](https://serde.rs) – Serialization 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/12187/bC40df3r_400x400.jpg' alt='Tokio'/> [Tokio](https://tokio.rs/) – Concurrency Frameworks

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