Add claude.md with info on the repo structure, to help Claude know where things are

Author: juliasilge

claude.md

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+# Quarto Development Guide
+
+## Project Overview
+
+Quarto is an open-source scientific and technical publishing system built on [Pandoc](https://pandoc.org). This repository contains the source code for various parts of the Quarto ecosystem, with the main CLI implementation housed in a separate repository ([quarto-cli](https://github.com/quarto-dev/quarto-cli)).
+
+### Main Components
+
+- **VS Code Extension**: The primary VS Code extension for working with Quarto documents
+- **Writer**: A web-based editor for Quarto documents
+- **LSP**: Language server for Quarto documents
+- **Core Packages**: Shared libraries used across multiple components
+
+## Repository Structure
+
+The repository is organized as a monorepo using Yarn workspaces:
+
+- `apps/`: Contains standalone applications
+  - `vscode/`: VS Code extension for Quarto
+  - `writer/`: Web-based Quarto editor
+  - `lsp/`: Language Server Protocol implementation
+  - `panmirror/`: WYSIWYG editor component
+- `packages/`: Contains shared libraries
+  - `core/`: Core functionality shared across packages
+  - `editor-*/`: Editor-related packages
+  - `quarto-core/`: Quarto-specific core functionality
+  - Other utility packages
+
+
+## Additional Resources
+
+- [Quarto Website](https://quarto.org)
+- [Extension on Microsoft marketplace](https://marketplace.visualstudio.com/items?itemName=quarto.quarto)
+- [Extension on Open VSX Registry](https://open-vsx.org/extension/quarto/quarto)
+- [Quarto GitHub Organization](https://github.com/quarto-dev)