Add appstream metadata

appimage/NickelBridge.AppDir/usr/share/metainfo/nickelbridge.appdata.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<component type="desktop-application">
+	<id>nickelbridge</id>
+	<metadata_license>MPL-2.0</metadata_license>
+	<project_license>MPL-2.0</project_license>
+	<name>NickelBridge</name>
+	<summary>Desktop app to enable direct use of receipt printers in web apps</summary>
+	<description>
+		<p>NickelBridge is a simple utility that allows web apps to interface with receipt printers. It runs a simple web server listening on localhost:64269 that accepts JSON-format receipts and attempts to print them to whatever device is configured in the UI.</p>
+		<p>NickelBridge uses node-thermal-printer to print receipts. It therefore supports the Epson ESC/POS and STAR protocols.</p>
+	</description>
+	<launchable type="desktop-id">nickelbridge.desktop</launchable>
+	<url type="homepage">https://netsyms.biz/apps/nickelbridge</url>
+	<screenshots>
+		<screenshot type="default">
+			<image>https://netsyms.biz/data/uploads/apps/nickelbridge/screenshot.png</image>
+		</screenshot>
+	</screenshots>
+	<provides>
+		<id>nickelbridge.desktop</id>
+	</provides>
+</component>