Add docs and Help link + Toasts

docs/HELP.md

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+<p align="center">
+  <img src="../src/resources/net.jeena.Recoder.svg" width="120" height="120" alt="Recoder logo">
+</p>
+
+# Recoder — Help Guide
+
+Recoder is a minimal, user-friendly tool for batch video transcoding. This quick guide walks you through using the app.
+
+---
+
+## 🚀 Getting Started
+
+When you open Recoder, you’ll see a prompt inviting you to drop a video file or folder:
+
+![Initial View](screenshot-1.png)
+
+### 📂 Dropping Files or Folders
+
+- You can drop **one video file** or **one folder** containing video files onto the app.
+- The folder can have subdirectories, but Recoder will **not** process files recursively. Only files in the dropped folder itself will be processed.
+- Non-video files will be ignored.
+
+### 🔧 Preparing to Transcode
+
+After you drop a folder into Recoder, it will list all the video files it found:
+
+![Folder Loaded](./screenshot-2.png)
+
+- A blue **Transcode** button appears once the files are ready to process.
+- The **Clear icon** is always available — click it to cancel everything and reset the app if you're done or need to start over.
+- The **menu button** gives access to Preferences and Help.
+
+---
+
+## 🎬 Transcoding
+
+Click the Transcode button to start processing. While transcoding:
+
+![Transcoding in Progress](./screenshot-3.png)
+
+- The blue **Transcode** button is replaced by a **Pause** button, allowing you to temporarily stop the process.
+- If paused, the button changes to **Resume**, so you can continue when you're ready.
+- The **Clear button** can also be used during transcoding to cancel the process entirely and clear the current session.
+
+By default:
+
+- Transcoded files are saved into the same directory as the source, inside a subfolder named `{{source_folder_name}}-transcoded`.
+- File names remain the same as the originals but with a `.mov` extension.
+
+---
+
+### ⚙️ Preferences
+
+In Preferences, you can customize the single **output folder path** where transcoded files will be saved. This path controls both the folder’s location and name. You can use:
+
+- `{{source_folder_name}}` to reuse the original folder name
+- Relative paths like `../done/`
+- Absolute paths like `/mnt/Export/`
+- `~` to refer to your home directory
+- Simple names like `output` to create a folder inside the source folder
+- Any combination of the above, e.g. `../{{source_folder_name}}-dnxhd`
+
+![Preferences](screenshot-4.png)
+
+---
+
+## 💡 Notes
+
+- Make sure you have enough free space on your drive because both the original and transcoded files are kept, and transcoded files may be larger.
+
+---
+
+If you need more help, check the [GitHub repository](https://github.com/jeena/recoder) or open an issue.