Update roadmap and readme

[lilai23]

What type of PR is this?

Doc

What this PR does / why we need it?

Add or modify some content in roadmap and readme document

Which issue(s) this PR fixes？

Fixes #1507

Does this PR introduce a user-facing change?

No

Checklist

• Make sure there is a GitHub_issue related with this PR before you start working on it.
• Make sure you have squashed your change to one single commit.
• GitHub Actions works fine in this PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.71%. Comparing base (fae94c6) to head (23c3f0a).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop    #1508   +/-   ##
==========================================
  Coverage      42.71%   42.71%           
  Complexity       181      181           
==========================================
  Files           1273     1273           
  Lines          27331    27331           
  Branches        2815     2815           
==========================================
  Hits           11674    11674           
  Misses         14253    14253           
  Partials        1404     1404           

Flag	Coverage Δ
unittests	42.71% <ø> (ø)

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