add roadmap and todo
Add 'docs/' from commit 'b1bada0845cd10d924088f3607eb50cb9854c35c'

git-subtree-dir: docs
git-subtree-mainline: 69930b5ec5f2426a3ee6ab6532ad73b22e6bdd4c
git-subtree-split: b1bada0845cd10d924088f3607eb50cb9854c35c