docs: add daocloud adopter

[zgfh]

Ⅰ. Describe what this PR did

add daocloud adopter

Ⅱ. Does this pull request fix one issue?

NONE

Ⅲ. Why don't you add test cases (unit test/integration test)? (你真的觉得不需要加测试吗？)

NONE

Ⅳ. Describe how to verify it

NONE

Ⅴ. Special notes for reviews

[pouchrobot]

Thanks for your contribution. 🍻 @zgfh
While we thought PR TITLE could be more specific, longer than 20 chars.
Please edit this PR title instead of opening a new one.
More details, please refer to https://github.com/dragonflyoss/Dragonfly/blob/master/CONTRIBUTING.md

[codecov-io]

Codecov Report

Merging #769 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #769      +/-   ##
==========================================
- Coverage   46.55%   46.53%   -0.02%     
==========================================
  Files         113      113              
  Lines        6354     6354              
==========================================
- Hits         2958     2957       -1     
  Misses       3158     3158              
- Partials      238      239       +1

Impacted Files	Coverage Δ
supernode/daemon/mgr/scheduler/manager.go	24.06% <0%> (-0.76%)	⬇️

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[allencloud]

Could you also drop a comment in issue dragonflyoss/dragonfly#219? Thanks a lot. @zgfh
LGTM