Add Brewfile and local formula for KDSingleApplication-qt6

This commit introduces a Brewfile for managing dependencies required by the Strawberry Music Player on macOS, including build tools and runtime dependencies. Additionally, a local Homebrew formula for KDSingleApplication-qt6 is added to facilitate its installation, as it is not consistently available in Homebrew core. A README is also included to guide users on installation and usage.

Brewfile

@@ -0,0 +1,45 @@
+# Strawberry Music Player (macOS) - Homebrew Bundle
+#
+# Usage:
+#   brew bundle --file Brewfile
+#
+# Notes:
+# - This is intended for macOS (Apple Silicon or Intel).
+# - Some Strawberry features are optional and will auto-disable if deps are missing.
+
+# Build tooling
+brew "cmake"
+brew "pkg-config"
+brew "ninja"
+
+# Core runtime/build dependencies (required by CMakeLists.txt)
+brew "qt"          # Qt 6 (Core/Gui/Widgets/Network/Sql/Concurrent)
+brew "boost"
+brew "icu4c"
+brew "glib"        # provides glib-2.0 + gobject-2.0 (via pkg-config)
+brew "glib-networking" # TLS + GIO modules (helps macOS bundling via dist/macos/macgstcopy.sh)
+brew "glib-openssl"    # alternative TLS backend for GIO
+brew "sqlite"
+brew "taglib"
+brew "gstreamer"
+
+# Strawberry requires KDAB's KDSingleApplication (CMake package name: KDSingleApplication-qt6).
+# Homebrew core doesn't consistently provide it, so this repo includes a local formula.
+# Homebrew requires formulae to be installed from a tap; `brew bundle` will tap *this repo*
+# using the current working directory (run `brew bundle` from the repo root).
+tap "strawberry/local", "file://#{Dir.pwd}"
+brew "strawberry/local/kdsingleapplication-qt6"
+
+# Recommended GStreamer plugin sets for broad codec support (matches README guidance)
+brew "gst-plugins-base"
+brew "gst-plugins-good"
+brew "gst-plugins-bad"
+brew "gst-plugins-ugly"
+brew "gst-libav"
+
+# Helpful for Strawberry's macOS "deploy" target (GStreamer dynamically loads libsoup)
+brew "libsoup"
+
+# Optional: enable building the CMake "dmg" target (cmake/Dmg.cmake)
+brew "create-dmg"
+