Add some linux files for distributors

AM2RLauncher/distribution/linux/AM2RLauncher.appdata.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Copyright 2022 AM2R Community Developers -->
+<component type="desktop-application">
+    <id>io.github.am2rcommunitydevelopers.AM2RLauncher</id>
+    <metadata_license>CC0-1.0</metadata_license>
+    <project_license>GPL-3.0</project_license>
+    <name>AM2RLauncher</name>
+    <developer_name>AM2R Community Developers</developer_name>
+    <summary>A front-end for dealing with AM2R updates and mods</summary>
+    <categories>
+        <category>Game</category>
+    </categories>
+    <description>
+        <p>A front-end application that simplifies installing the latest AM2R-Community-Updates, creating APKs for Android use, as well as Mods for AM2R.</p>
+    </description>
+    <launchable type="desktop-id">io.github.am2rcommunitydevelopers.AM2RLauncher.desktop</launchable>
+    <url type="homepage">https://github.com/AM2R-Community-Developers/AM2RLauncher</url>
+    <url type="bugtracker">https://github.com/AM2R-Community-Developers/AM2RLauncher/issues</url>
+    <url type="faq">https://github.com/AM2R-Community-Developers/AM2RLauncher/wiki/FAQ</url>
+    <url type="help">https://github.com/AM2R-Community-Developers/AM2RLauncher/wiki</url>
+    <releases>
+        <release version="2.2.0" date="2022-01-07"/>
+    </releases>
+    <content_rating type="oars-1.1">
+        <content_attribute id="violence-cartoon">moderate</content_attribute>
+        <content_attribute id="violence-fantasy">moderate</content_attribute>
+        <content_attribute id="language-humor">mild</content_attribute>
+    </content_rating>
+    <screenshots>
+        <screenshot type="default">
+            <caption>Initial screen of AM2RLauncher</caption>
+            <image type="source" width="822" height="759">https://cdn.discordapp.com/attachments/509717926807601182/999676114492461056/unknown.png</image>
+        </screenshot>
+    </screenshots>
+</component>

AM2RLauncher/distribution/linux/AM2RLauncher.desktop

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+[Desktop Entry]
+Type=Application
+Categories=Game
+Encoding=UTF-8
+Name=AM2RLauncher
+Comment=A front-end application that simplifies installing the latest AM2R-Community-Updates, creating APKs for Android use, as well as Mods for AM2R.
+Exec=AM2RLauncher
+Icon=AM2RLauncher
+Terminal=false
+SingleMainWindow=true

AM2RLauncher/distribution/linux/readme.txt

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+In here, you will find an appdata, .desktop file and an icon if you wish to redistribute the AM2RLauncher to somewhere else.
+It should also be noted, that you can use the `NoAutoUpdate` configuration, in order to build the AM2RLauncher with the auto-updating features disabled.