docs: better arch to add connection between cri manager and pouchd

[allencloud]

Signed-off-by: Allen Sun [email protected]

Ⅰ. Describe what this PR did

After discussing with @fanux about the architecture of PouchContainer, we found that we should add a connection between pouchd and cri-manager, and this will tell users that with using Kubernetes, pouchcontainer can still provide containers with powerful runtime support, like lxcfs and diskquota and so on.

Ⅱ. Does this pull request fix one issue?

none

Ⅲ. Describe how you did it

none

Ⅳ. Describe how to verify it

none

Ⅴ. Special notes for reviews

none

[codecov-io]

Codecov Report

Merging #1465 into master will increase coverage by 23.71%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #1465       +/-   ##
===========================================
+ Coverage   16.36%   40.08%   +23.71%     
===========================================
  Files         207      250       +43     
  Lines       13816    16351     +2535     
===========================================
+ Hits         2261     6554     +4293     
+ Misses      11399     8952     -2447     
- Partials      156      845      +689

Impacted Files	Coverage Δ
daemon/logger/jsonfile/utils.go	70% <0%> (ø)	⬆️
storage/volume/modules/local/local.go	70.68% <0%> (ø)
lxcfs/lxcfs.go	55.55% <0%> (ø)
cri/stream/httpstream/httpstream.go	0% <0%> (ø)
apis/metrics/metrics.go	100% <0%> (ø)
cri/stream/remotecommand/websocket.go	0% <0%> (ø)
registry/auth.go	54.12% <0%> (ø)
storage/quota/grpquota.go	0% <0%> (ø)
network/mode/bridge/bridge.go	67.74% <0%> (ø)
cri/stream/remotecommand/exec.go	0% <0%> (ø)
... and 111 more

[allencloud]

LGTM