Rename README to README.md

Since the CI will check mardkwon format files, the README files will
be updated to `.md` suffix.

Signed-off-by: George Liu <liuxiwei@ieisystem.com>
Change-Id: I6175f53024

Rename README to README.md

Since the CI will check mardkwon format files, the README files will
be updated to `.md` suffix.

Signed-off-by: George Liu <liuxiwei@ieisystem.com>
Change-Id: I6175f53024559b41e05c2bd91d76548c889cb3ca

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