Add README

Author: garrettgu10

README.md

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+# Workers Pyodide Build System
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+This repository contains scripts and GitHub Actions which can be used to generate the build artifacts needed to run Python Workers on Cloudflare's Workers Runtime. These scripts operate on the [Cloudflare Pyodide fork](https://github.com/cloudflare/pyodide).
+
+There are two components of this repo. You can read more on usage in each component's README.md file.
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+- `packages/` is responsible for building the package bundle and index.
+- `pyodide/` is responsible for building the Pyodide interpreter itself, then modifying ("linking") it to run within workerd.