docs: add clusterimportpolicy example for kubevela #243

[muma378]

Signed-off-by: Xiao Yang [email protected]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Add an example to show how to import clusters added from kubevela.

Which issue(s) this PR fixes: Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[clusterpedia-bot]

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[Iceber]

/lgtm @muma378 Thank you for adding the kubevela import policy