Add getting started guide and Windows packaging

GETTING_STARTED.md

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+# Getting Started
+
+StepForge is a fully offline desktop app. Nothing is uploaded or synced, and
+all guides stay on your machine.
+
+## 1. Install
+
+From the repository root:
+
+```bash
+npm install
+```
+
+That installs Electron and the local packaging tools used by the scripts.
+
+## 2. Launch the app
+
+```bash
+npm start
+```
+
+The first launch creates the local StepForge data directory. On Linux it is
+usually under `~/.local/share/stepforge`. On Windows it is usually under
+`%APPDATA%/stepforge`.
+
+## 3. Create your first guide
+
+In the library view:
+
+1. Click `New guide`.
+2. Give the guide a clear title.
+3. Open the guide to enter the editor.
+
+You can also import a guide archive with `Import archive` if you already have
+one.
+
+## 4. Add content
+
+There are two simple ways to start:
+
+1. Import screenshots with the `Import` button in the editor.
+2. Paste an image from the clipboard if you already copied one.
+
+If you want to capture new screenshots, open `Quick` actions and start a
+capture session. Use `Settings` to set the capture hotkey and other capture
+options.
+
+## 5. Edit the guide
+
+The editor is split into three panes:
+
+1. Steps on the left
+2. Canvas in the center
+3. Properties on the right
+
+Use the canvas tools to add shapes, arrows, text, blur, highlight, numbers,
+and crops. Use the right pane to edit the step title, description, and
+annotation details.
+
+## 6. Save and export
+
+Use these actions from the top bar:
+
+1. `Save` writes the guide to disk.
+2. `Export` opens format choices such as JSON, Markdown, HTML, PDF, GIF,
+   image bundle, DOCX, and PPTX.
+3. `Linked` shows archive details when a guide is linked to a shared `.sfgz`
+   file.
+
+If you want to find commands quickly, press `Ctrl+/` for Quick Actions.
+
+## Useful shortcuts
+
+1. `Ctrl+/` opens Quick Actions
+2. `Ctrl+S` saves the current guide
+3. `Ctrl+Z` undoes the last edit
+4. `Ctrl+Shift+Z` redoes the last edit
+5. `Alt+Up` and `Alt+Down` move the selected step
+
+## If something is missing
+
+1. Open `Settings` to review capture, export, and editor options.
+2. Run `npm run sample` to generate a sample guide and exported examples.
+3. Run `bash scripts/verify.sh` to check the full offline workflow.
+
+## Optional builds
+
+1. `bash scripts/build-release.sh` assembles the offline release layout.
+2. `npm run package:windows` creates the portable Windows `.exe` in
+   `releases/`.
+3. `bash scripts/package-linux.sh` creates Linux release artifacts.