Add flatpak files

flatpak/io.github.chkr1011.mqttMultimeter.desktop

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+[Desktop Entry]
+Name=mqttMultimeter
+Icon=io.github.chkr1011.mqttMultimeter
+Exec=mqttMultimeter
+Terminal=false
+Type=Application
+Comment=MQTT Desktop Client
+Categories=Utility;Development;IDE;

flatpak/io.github.chkr1011.mqttMultimeter.metainfo.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<component type="desktop-application">
+  <id>io.github.chkr1011.mqttMultimeter</id>
+
+  <name>mqttMultimeter</name>
+  <summary>A Cross-platform MQTT Desktop Client and Debugger</summary>
+
+  <metadata_license>MIT</metadata_license>
+  <project_license>MIT</project_license>
+
+  <developer_name>Christian Kratky</developer_name>
+
+  <url type="homepage">https://github.com/chkr1011/mqttMultimeter</url>
+
+  <releases>
+    <release version="1.9.0.290" date="2024-08-04">
+      <description>https://github.com/chkr1011/mqttMultimeter/releases/tag/v1.9.0.290</description>
+    </release>
+  </releases>
+
+  <recommends>
+    <control>pointing</control>
+    <control>keyboard</control>
+  </recommends>
+
+  <description>
+    <p>
+      MQTT Multimeter is a cross platform .NET application for MQTT communication testing and analysing.
+    </p>
+
+    <p>
+      Features:
+      <ul>
+        <li>Powerful inspection of message data.</li>
+        <li>Inspection of raw MQTT messages.</li>
+        <li>Publishing of messages.</li>
+        <li>Subscribing of messages.</li>
+        <li>MQTTv5 features like user properties etc.</li>
+        <li>Storage of application state (connections, subscriptions etc.).</li>
+      </ul>
+    </p>
+
+    <p>
+      Supported MQTT protocol versions:
+      <ul>
+        <li>3.1.0</li>
+        <li>3.1.1</li>
+        <li>5.0.0</li>
+      </ul>
+    </p>
+
+    <p>
+      The protocol implementation is based on the MQTTnet project. The application uses Avalonia for UI rendering and runs on nearly any platform and CPU architecture.
+    </p>
+
+  </description>
+
+  <launchable type="desktop-id">io.github.chkr1011.mqttMultimeter.desktop</launchable>
+  <screenshots>
+    <screenshot type="default">
+      <image>https://raw.githubusercontent.com/chkr1011/mqttMultimeter/ed708573f33392a10f7a82f3f2342684aeb0e87a/Images/Screenshots/InflightPage.png</image>
+    </screenshot>
+  </screenshots>
+</component>