add kcsdr_source to the readme #1371

Job	Run time
build_windows	12m 32s
build_macos_arm	2m 17s
build_debian_bookworm	3m 36s
build_debian_bullseye	3m 0s
build_debian_buster	3m 1s
build_debian_sid	3m 37s
build_macos_intel	4m 48s
build_ubuntu_focal	3m 38s
build_ubuntu_jammy	3m 5s
build_ubuntu_mantic	3m 34s
build_ubuntu_noble	3m 44s
build_raspios_bullseye_armhf	9m 0s
build_android	12m 34s
check_formatting	11s
check_spelling	21s
create_full_archive	17s
update_nightly_release	6s
	1h 9m 21s

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