🚀 (Sparkle) Deploy first Sparkle appcast.xml

Updates will work now :D

appcast.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" standalone="yes"?>
+<rss xmlns:sparkle="http://www.andymatuschak.org/xml-namespaces/sparkle" version="2.0">
+    <channel>
+        <title>Gravity</title>
+        <item>
+            <title>1.2.0</title>
+            <pubDate>Thu, 11 Jan 2024 11:13:57 -0800</pubDate>
+            <sparkle:version>1</sparkle:version>
+            <sparkle:shortVersionString>1.2.0</sparkle:shortVersionString>
+            <sparkle:minimumSystemVersion>14.0</sparkle:minimumSystemVersion>
+            <enclosure url="https://github.com/InvisibilityInc/GravityAI/releases/download/release/GravityInstaller.dmg" length="18048742" type="application/octet-stream"/>
+        </item>
+    </channel>
+</rss>