feat: added ShellinaBox (#709)

* Added ShellinaBox
* Correct license info

---------

Co-authored-by: Martijn van der Kleijn <[email protected]>

Author: listiges-kaenguru

ShellinaBox/ShellinaBox.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace App\SupportedApps\ShellinaBox;
+
+class ShellinaBox extends \App\SupportedApps
+{
+}

ShellinaBox/app.json

@@ -0,0 +1,10 @@
+{
+    "appid": "e86ecd660f4e9dc4b3b7515318dbd8de6a836ef8",
+    "name": "Shell in a Box",
+    "website": "https://github.com/shellinabox/shellinabox",
+    "license": "GNU General Public License version 2",
+    "description": "Shell In A Box implements a web server that can export arbitrary command line tools to a web based terminal emulator. This emulator is accessible to any JavaScript and CSS enabled web browser and does not require any additional browser plugins.",
+    "enhanced": false,
+    "tile_background": "light",
+    "icon": "shellinabox.png"
+}