Add an initial CHANGELOG.md for v0.1.0
Add an initial CHANGELOG.md for v0.1.0

Add an initial CHANGELOG.md using the rust-vmm template, indicating
that v0.1.0 is the first release

Signed-off-by: Sergio Lopez <2a49a3230a2bdfb748295d04d38c6f188489c774@redhat.com>

rust-vmm/vhost