chore(docs): add readme for each workspace

.changeset/six-buckets-grab.md

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+---
+"@stackoverflow/stacks": patch
+"@stackoverflow/stacks-docs": patch
+---
+
+chore(docs): add readme for each workspace

packages/stacks-classic/README.md

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+# Stacks
+
+[![ci status][gh-action-badge]][gh-action-url] [![npm version][npm-badge]][npm-url]
+
+Stacks is Stack Overflow’s design system. It includes the resources needed to create consistent, predictable interfaces and workflows that conform to Stack Overflow’s principles, design language, and best practices.
+
+Our documentation is built with Stacks itself, using its [immutable, atomic classes](http://johnpolacek.com/rethinking/) and components.
+
+The [Stacks website](https://stackoverflow.design/) documents:
+
+## Product
+- Semantic and accessible component markup
+- Cross-browser compatible Less / CSS
+- An [icon library](https://github.com/StackExchange/Stacks-Icons)
+
+## Email
+- Email templates & components
+
+# Using Stacks
+Using Stacks is outlined in our [usage guidelines](https://stackoverflow.design/product/develop/using-stacks).
+
+## Migrating from v1 to v2
+
+To migrate from Stacks v1 to v2, see our [migration guide](/MIGRATION_GUIDE.md).

packages/stacks-docs/README.md

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+# Stacks Docs
+
+This workspace contains the Stacks documentation project that’s hosted on: https://stackoverflow.design/
+
+To contribute to Stacks documentation you can build locally via:
+```sh
+npm start
+```
+This command will pull up the local dev server at http://localhost:8080. You can also view our [building guidelines](https://stackoverflow.design/product/develop/building).
+
+# Release management
+Refer to the main [README.md](../../README.md) for details on how releases are currently managed.
+
+# Bugs and feature requests
+Have a bug or feature request? First search existing or closed issues to make sure the issue hasn’t been noted yet. If not, review our [issue guidelines](../../CONTRIBUTING.md#open-an-issue) for submitting [a bug report](../../CONTRIBUTING.md#reporting-bugs) or [feature request](../../CONTRIBUTING.md#feature-requests).