feat: add unistore configuration and spritesheet assets for mice music player

unistore/mice.unistore

@@ -0,0 +1,44 @@
+{
+	"storeInfo": {
+		"title": "mice unistore",
+		"author": "sillyangel",
+		"description": "A music player for the Nintendo 3DS",
+		"url": "https://git.sillyangel.dev/angel/mice-3ds/raw/branch/master/mice.unistore",
+		"file": "mice.unistore",
+		"sheetURL": "https://git.sillyangel.dev/angel/mice-3ds/raw/branch/master/unistore/spritesheet/sheet.t3x",
+		"sheet": "sheet.t3x",
+		"version": 4,
+		"revision": 0
+	},
+	"storeContent": [
+		{
+			"info": {
+				"title": "mice",
+				"author": "sillyangel",
+				"description": "A music player for the Nintendo 3DS. Plays PCM WAV, AIFF, FLAC, Opus, Vorbis and MP3 files.",
+				"category": ["utility", "music"],
+				"console": ["3DS"],
+				"icon_index": 0,
+				"sheet_index": 0,
+				"last_updated": "2025-12-07 at 00:00 (UTC)",
+				"license": "gpl-3.0",
+				"version": "dev63"
+			}
+            "mice.cia": [
+                {
+                    "type": "downloadFile",
+                    "file": "hhttps://git.sillyangel.dev/angel/mice-3ds/releases/download/latest/mice.cia",
+                    "output": "sdmc:/mice.cia"
+                },
+                {
+                    "type": "installCia",
+                    "file": "/mice.cia"
+                },
+                {
+                    "type": "deleteFile",
+                    "file": "sdmc:/mice.cia"
+                }
+            ],
+		}
+	]
+}

unistore/spritesheet/sheet.t3s

@@ -0,0 +1,3 @@
+--atlas -f rgba -z auto
+
+0.png