Add `CHANGELOG.md`

[waywardmonkeys]

@xStrom Should I rebase, squash or merge commit? :)

[richard-uk1]

@xStrom Should I rebase, squash or merge commit? :)

Good question - IIRC we talked about it and prefer squash commits, but I may be wrong. I don't think it matters too much.

[xStrom]

Squash, merge queues will arrive sometime in the future. 😆