Add AltStore source and update README

apps.json

@@ -0,0 +1,18 @@
+{
+  "name": "SpotiFLAC Source",
+  "identifier": "com.zarzet.spotiflac.source",
+  "subtitle": "FLAC Downloader for iOS",
+  "apps": [
+    {
+      "name": "SpotiFLAC",
+      "bundleIdentifier": "com.zarzet.spotiflac",
+      "developerName": "zarzet",
+      "version": "3.8.0",
+      "versionDate": "2026-03-14",
+      "downloadURL": "https://github.com/zarzet/SpotiFLAC-Mobile/releases/download/v3.8.0/SpotiFLAC-v3.8.0-ios-unsigned.ipa",
+      "localizedDescription": "Mobile version of SpotiFLAC written in Flutter. Download Tracks in true FLAC from Tidal, Qobuz, & Amazon Music.",
+      "iconURL": "https://raw.githubusercontent.com/zarzet/SpotiFLAC-Mobile/main/assets/icon/icon.png",
+      "size": 33659289
+    }
+  ]
+}