feat(git-editor): Adds a new extension that lets the user use vicinae as a git editor

extensions/git-editor/.gitignore

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+node_modules
+vicinae-env.d.ts

extensions/git-editor/README.md

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+# Git Editor
+
+Use Vicinae as your git editor for commits and interactive rebases.
+
+## Features
+
+### Git Commit
+
+Write commit messages with a user-friendly interface. Choose between two commit styles:
+
+- **Conventional Commits** - Structured commit messages with type, scope, and breaking change indicators
+  - Types: `feat`, `fix`, `docs`, `ci`, `wip`
+  - Optional scope
+  - Breaking change flag
+- **Simple** - Free-form commit message
+
+You can swap between commit styles at any time while writing your message.
+
+### Interactive Rebase
+
+A visual interface for `git rebase -i` with full control over your commits:
+
+- **Reorder commits** - Move commits up/down with `Ctrl+W` / `Ctrl+S`
+- **Change commit actions** - Quick shortcuts for common operations:
+  - `p` - Pick
+  - `e` - Edit
+  - `r` - Reword
+  - `f` - Fixup
+  - `d` - Drop
+
+Commits are displayed with their hash, message, date, and current action (color-coded).
+
+## Setup
+
+The extension includes a built-in setup wizard. When you first run it:
+
+1. Open the Git Commit or Git Sequence command in Vicinae
+2. Press `Ctrl+Enter` to automatically configure git
+
+This sets the following git configuration:
+
+```bash
+git config --global core.editor "git-vicinae-editor"
+git config --global sequence.editor "git-vicinae-sequence-editor"
+```
+
+## Usage
+
+After setup, simply use git as normal:
+
+```bash
+# For commits
+git commit
+
+# For interactive rebase
+git rebase -i HEAD~5
+```
+
+Vicinae will automatically open with the appropriate interface.
+
+## Preferences
+
+| Name | Type | Default | Description |
+|------|------|---------|-------------|
+| Commit Type | Dropdown | Conventional Commits | Choose between Conventional Commits or Simple format |
+