feat: add tmux-provider plugin (#151)

* feat: add tmux-provider plugin

* fix: invalid thumbnail name

* fix: invalid translation keys

* docs: README updated to include launcher provider entry

Also fixed wording for requirements (validation failed for some reason?)

tmux-provider/README.md

@@ -0,0 +1,59 @@
+# tmux Provider
+
+A launcher provider plugin for searching running tmux sessions, or tmuxp configurations, and
+attaching the sessions.
+
+## Plugin
+
+| Field           | Value                         |
+| --------------- | ----------------------------- |
+| ID              | `dunarand/tmux-provider`      |
+| Entry           | Launcher provider: `provider` |
+| Launcher Prefix | `/tm`                         |
+
+## Requirements
+
+- Noctalia v5.0.0 or higher
+- Requires `tmux`: [Install tmux](https://github.com/tmux/tmux/wiki/installing)
+- `tmuxp`: Optional dependency, [install tmuxp](https://tmuxp.git-pull.com/)
+
+tmuxp is completely optional. If you want tmuxp configurations to be included in the search, enable
+tmuxp option in the plugin settings.
+
+![](./assets/preview-2.png)
+
+## Usage
+
+Simply open your launcher and type the session you're looking for after the `/tm` prefix.
+
+![](./assets/preview-1.png)
+
+Selecting an entry and pressing Return / Enter launches the default terminal and attaches the tmux
+session.
+
+## Settings
+
+| Setting     | Type   | Default | Description                                                |
+| ----------- | ------ | ------- | ---------------------------------------------------------- |
+| `use_tmuxp` | `bool` | `false` | Enables tmuxp configurations to be included in the search. |
+
+## Notes
+
+**Limitations:**
+
+- With the current implementation, we attach sessions via the following commands:
+
+  - **tmux:**
+
+    ```
+    tmux attach -t <session>
+    ```
+
+  - **tmuxp:**
+
+    ```
+    tmuxp load <session>
+    ```
+
+- The current implementation only utilizes tmuxp. Other tmux configuration tools such as tmuxinator
+  will be added in the future.