Add desktop and metainfo files for flatpak distrbution

dist/com.connorcode.mslicer.desktop

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+[Desktop Entry]
+Type=Application
+Version=1.0
+Name=mslicer
+GenericName=MSLA slicer
+Comment=An experimental open source slicer for masked stereolithography (resin) printers
+Exec=mslicer
+Terminal=false
+Icon=com.connorcode.mslicer
+Categories=Engineering;Printing;

dist/com.connorcode.mslicer.metainfo.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<component type="desktop">
+	<id>com.connorcode.mslicer</id>
+	<name>mslicer</name>
+
+	<metadata_license>CC0-1.0</metadata_license>
+	<project_license>GPL-3.0</project_license>
+	<launchable type="desktop-id">com.connorcode.mslicer.desktop</launchable>
+	<content_rating type="oars-1.0" />
+
+	<url type="homepage">https://github.com/connorslade/mslicer</url>
+	<url type="bugtracker">https://github.com/connorslade/mslicer/issues</url>
+	<update_contact>connor@connorcode.com</update_contact>
+	<developer id="com.connorcode">
+		<name>Connor Slade</name>
+	</developer>
+
+	<icon type="stock">com.connorcode.mslicer</icon>
+	<summary>Masked stereolithography slicer</summary>
+	<description>
+		<p>
+            An experimental open source slicer for masked stereolithography (resin) printers.
+            Currently only ELEGOO <code>.goo</code> files can be generated.
+        </p>
+	</description>
+	<keywords>
+	   <keyword>3d printing</keyword>
+	</keywords>
+
+	<screenshots>
+		<screenshot type="default" xml:lang="en">
+			<image type="source">https://github.com/user-attachments/assets/ca282fea-680d-4825-aca1-36d9e29fc1fe</image>
+		</screenshot>
+	</screenshots>
+
+	<releases>
+		<release version="0.1.0" date="2025-02-12">
+		    <description>
+			    <p>Initial release.</p>
+			</description>
+		</release>
+	</releases>
+
+	<categories>
+		<category>Utility</category>
+		<category>Engineering</category>
+	</categories>
+
+	<branding>
+        <color type="primary" scheme_preference="light">#99c1f1</color>
+        <color type="primary" scheme_preference="dark">#3584e4</color>
+    </branding>
+
+	<provides>
+		<binary>mslicer</binary>
+	</provides>
+
+	<recommends>
+        <control>keyboard</control>
+        <control>pointing</control>
+    </recommends>
+</component>