docs: split and improve

docs/getting-started.md

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+
+# Getting Started with VSCodium
+
+This guide will help you get started with VSCodium.
+
+## Table of Contents
+
+- [Installation](#installation)
+- [First Steps](#first-steps)
+- [Basic Usage](#basic-usage)
+- [Keyboard Shortcuts](#keyboard-shortcuts)
+- [Next Steps](#next-steps)
+
+## <a id="installation"></a>Installation
+
+VSCodium can be installed on Windows, macOS, and Linux. Visit the [download page](https://vscodium.com/#install) for installation instructions.
+
+## <a id="first-steps"></a>First Steps
+
+After installing VSCodium, here are some first steps to get started:
+
+1. **Open a folder**: Use File > Open Folder to open your project
+2. **Install extensions**: Click on the Extensions icon in the sidebar to browse and install extensions
+3. **Configure settings**: Use File > Preferences > Settings to customize your editor
+
+## <a id="basic-usage"></a>Basic Usage
+
+VSCodium works just like Visual Studio Code, with a few differences:
+
+- It uses Open VSX for extensions by default instead of the Visual Studio Marketplace
+- It doesn't include Microsoft telemetry or branding
+- Some proprietary features may not be available
+
+## <a id="keyboard-shortcuts"></a>Keyboard Shortcuts
+
+Here are some essential keyboard shortcuts to get you started:
+
+- `Ctrl+P` (Windows/Linux) or `Cmd+P` (macOS): Quick Open, Go to File
+- `Ctrl+Shift+P` (Windows/Linux) or `Cmd+Shift+P` (macOS): Show Command Palette
+- `Ctrl+,` (Windows/Linux) or `Cmd+,` (macOS): User Settings
+- `Ctrl+K Ctrl+S` (Windows/Linux) or `Cmd+K Cmd+S` (macOS): Keyboard Shortcuts
+
+## <a id="next-steps"></a>Next Steps
+
+Once you're comfortable with the basics, you might want to:
+
+- Explore the [documentation](https://github.com/VSCodium/vscodium/blob/master/docs/index.md) for more details
+- Join the [community](https://github.com/VSCodium/vscodium/discussions) to ask questions and share tips
+- Contribute to the [project](https://github.com/VSCodium/vscodium/blob/master/CONTRIBUTING.md) if you're interested