feat: album cover support copy-paste from the old SP codebase

README.md

@@ -13,3 +13,17 @@ Windows|[Supported Formats In DirectsShow](https://msdn.microsoft.com/en-us/libr
 macOS|[Media formats supported by QuickTime Player](https://support.apple.com/en-us/HT201290)|Sorry, I don't know...
 Unix/Linux|depends on [GStreamer](https://gstreamer.freedesktop.org/) plugins which user installed|[GStreamer Plug-ins: gst-plugins-base, gst-plugins-good, gst-plugins-ugly, gst-plugins-bad](https://gstreamer.freedesktop.org/documentation/additional/splitup.html?gi-language=c)
 
+## About License
+
+Since this is a toy repo, I don't spend much time about the license stuff. Currently this project use some assets and code from [ShadowPlayer](https://github.com/ShadowPower/ShadowPlayer), which have a very interesting license -- do whatever you want but cannot be used as homework -- obviously it's not a so called *free* license. I *may* do some license housecleaning works by replaceing the assets and code implementation when the code become reasonable, and the final codebase may probably released under MIT license.
+
+Anyway here is a list of file which is in non-free state (with license: do whatever you want but cannot be used as homework):
+
+ - All png images inside `icons` folder.
+ - FlacPic.h
+ - ID3v2Pic.h
+ - seekableslider.{h,cpp}
+
+Also there are some source code which I copy-paste from Qt codebase, which released under BSD-3-Clause license by the Qt Company:
+
+ - playlistmodel.{h,cpp}