Ddpk: Add README #91

Job	Run time
check / editor-config	12s
check / clang-checks	1m 32s
build-os-matrix	2s
rpm-build (oraclelinux:9) / rpm-build	5m 36s
build (oraclelinux:9) / build	2m 42s
make-tests (oraclelinux:9) / tests	2m 22s
rpm-install (oraclelinux:9) / rpm-install	1m 8s
	13m 34s

Provide feedback