add killercoda example: install karmada through CLI

[JadeFlute0127]

Signed-off-by: [JadeFlute0127] [1635468471@qq.com]

What this PR does / why we need it: add killercoda example: install karmada through CLI

Which issue(s) this PR fixes: Part of #1

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[karmada-bot]

Welcome @JadeFlute0127! It looks like this is your first PR to karmada-io/playground 🎉

[jwcesign]

Please replace the word Fix with Part of.

[JadeFlute0127]

I think these problems have been solved~

[jwcesign]

Could you please share the scenario link for your experiment on Killercoda?

[JadeFlute0127]

Could you please share the scenario link for your experiment on Killercoda?

https://killercoda.com/zhangdiandian/scenario/karmada-CLI-installtion-and-deploy-example

[JadeFlute0127]

fix done

[jwcesign]

cc @RainbowMango, could you please review this? Overall, it looks good to me.

[RainbowMango]

Sure. /assign

[JadeFlute0127]

it looks fix done

[jwcesign]

2.Do we need verification for each steps?

I think that the following steps require the completion of the previous steps.

[jwcesign]

/lgtm cc @RainbowMango for final checking

[karmada-bot]

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[JadeFlute0127]

remove about deploy workload info in intro.md and finish.md

[jwcesign]

/lgtm