create readme.md

Author: henryhale

README.md

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+# MathFlow | Docs
+
+## Overview
+
+This repository contains source code for the [mathflow](https://github.com/mathflowjs/mathflow)'s documentation [website](https://mathflow.js.org).
+
+## Development
+
+The website is built using [Vitepress](https://vitepress.dev) and [Vue](https://vuejs.org).
+Ensure that [nodejs](https://nodejs.org) and [pnpm](https://pnpm.io) are installed. 
+- Local development: `pnpm dev`
+- Building: `pnpm build`
+
+## License
+
+MIT