chore: add GitHub pull request template #183

Job	Run time
check / editor-config	12s
check / clang-checks	1m 37s
build-os-matrix	3s
build (oraclelinux:9) / build	2m 7s
rpm-build (oraclelinux:9) / rpm-build	5m 50s
make-tests (oraclelinux:9) / tests	1m 48s
rpm-install (oraclelinux:9) / rpm-install	1m 18s
	12m 55s

Provide feedback