Revert "Update buildnumber.properties"

This reverts commit 9b3bc77c7da6b02e4320f7ca60b564d50619a312.
Revert "Update buildcreator.default.properties"

This reverts commit 687deb6591143ac06cd57c665fe52f3f4b8147e4.
Revert "Delete README.md"

This reverts commit cfcd25c09d232e81e33cd09e1d41d92be3a70ebd.
Revert "Delete CONTRIBUTING.md"

This reverts commit 1d42d88bb2839bf5a1434653dbd8757a46b1f0dd.