Improve README and add matrix link #1661

Job	Run time
test / test	1m 10s
release-notes	5s
pypi	48s
version	18s
pyinstaller (macos-14) / pyinstaller	1m 16s
pyinstaller (macos-12) / pyinstaller	2m 13s
pyinstaller (windows-latest) / pyinstaller	3m 43s
package-prep	16s
package-metadata	6s
flatpak	46s
package-windows-msix	50s
package-windows	1m 3s
package-macos (macos-12)	33s
package-macos (macos-14)	38s
deploy-msstore	0s
deploy-github	12s
pr-comment	0s
	13m 57s

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