website: Add gem5-21.1 roadmap

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
Change-Id: I5879b1bed1d33f40792c6d5a4bf53d6456925683
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/44705
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: Jason Lowe-Power <power.jg@gmail.com>
1 file changed