dhcp-client: add a very basic roadmap

Signed-off-by: Thomas Gazagnaire <thomas@gazagnaire.org>

base/dhcp-client/ROADMAP.md

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+## Roadmap
+
+Very basic roadmap, to be improved shortly.
+
+### Done
+
+- use 2 static binaries privileged + unikernel (calf) in the container,
+  connected via socketpairs and pipes.
+- use eBPF to filter DHCP traffic
+- redirect the calf's sterr/stdout to the priv container
+- the priv exposes a simple HTTP interface to the calf, and read/write
+  are stored into a local Datakit/Git repo.
+- use upstream MirageOS's charrua-core.
+
+### TODO
+
+- current: make the packets flow in both directions
+- use runc to isolate the calf
+- use seccomp to isolate the privileged container
+- use the DHCP results to actually update the system
+- add metrics aggregation (using prometheus)
+- better logging aggregation (using syslog)