feat: add repo readme and contributing

CONTRIBUTING.md

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+# Contributing
+
+🚧 Contribution guidelines will be available soon. If you'd like to contribute before they're finalized, you are more than welcome! 🙌 Please raise an issue, and we'll inform you how to proceed.

README.md

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+# ALEX Lab Foundation Docs
+
+This repository hosts the documentation website. It is built using [Gitbook](https://www.gitbook.com/).
+
+![ALEX Lab Foundation Banner](./docs/.gitbook/assets/alexlab_doc_cover_github.jpg)
+
+The ALEX Lab Foundation is a non-profit organization supporting the governance and growth of the ALEX DeFi protocol. 
+
+🔗 [alexlab.co](https://alexlab.co/) \
+👾 [app.alexlab.co](https://app.alexlab.co/)
+
+## What is ALEX
+
+ALEX is building the finance layer on Bitcoin. The ALEX DEX is the largest on Bitcoin layers (Stacks Chain) fully integrated with XLink, our cross-chain bridge aggregating liquidity across L2s and multi-chain, with LISA as our liquid staking platform.
+
+🔗 [alexgo.io](https://alexgo.io/) \
+🌉 [xlink.network](https://www.xlink.network/) \
+🌸 [lisalab.io](https://www.lisalab.io/)
+
+## Contributing
+
+🌟 Please refer to the guideline [here](./CONTRIBUTING.md).