Added Gatus

Gatus/Gatus.php

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+<?php
+
+namespace App\SupportedApps\Gatus;
+
+class Gatus extends \App\SupportedApps
+{
+}

Gatus/app.json

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+{
+    "appid": "df713b8b4238000416a2a9f31e0e7697b31bec56",
+    "name": "Gatus",
+    "website": "https://gatus.io/",
+    "license": "Apache License 2.0",
+    "description": "Gatus is a developer-oriented health dashboard that gives you the ability to monitor your services using HTTP, ICMP, TCP, and even DNS queries as well as evaluate the result of said queries by using a list of conditions on values like the status code, the response time, the certificate expiration, the body and many others. The icing on top is that each of these health checks can be paired with alerting via Slack, PagerDuty, Discord, Twilio and more.",
+    "enhanced": false,
+    "tile_background": "dark",
+    "icon": "gatus.png"
+}

Listmonk/Listmonk.php

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+<?php
+
+namespace App\SupportedApps\Listmonk;
+
+class Listmonk extends \App\SupportedApps
+{
+}

Listmonk/app.json

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+{
+    "appid": "a5b7013f56e4bedca9aaa8979a9c209fc5c6a12f",
+    "name": "Listmonk",
+    "website": "https://listmonk.app/",
+    "license": "GNU Affero General Public License v3.0",
+    "description": "Listmonk is a self-hosted, high performance one-way mailing list and newsletter manager. It comes as a standalone binary and the only dependency is a Postgres database.",
+    "enhanced": false,
+    "tile_background": "light",
+    "icon": "listmonk.png"
+}