License-Update:
- LICENCE renamed to LICENCE.md
- format changed
- add "SPDX-License-Identifier: BSD-3-Clause WITH PCRE2-exception" to the top of LICENCE file
- add contribution information
(From OE-Core rev: 290bcaad31ac87766cd08bc017326daf5c4bd60d)
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>