Add a case study about BOE for unionbigdata

[XiShanYongYe-Chang]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Add case study 数之联在 BOE 的 I3Plat 建设中使用 Karmada

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Deal with the translation of Chinese to English documents later.

[XiShanYongYe-Chang]

Hi @pandaoknight, can you help take a look?

[windsonsea]

这个 folder 后续要改成英文版内容吧：

• docs/casestudies/unionbigdata.md

[XiShanYongYe-Chang]

这个 folder 后续要改成英文版内容吧：

是的，但图片的部分不容易修改，关于其中一些平台的截图可能也无法进行修改。

[XiShanYongYe-Chang]

/cc @RainbowMango

[pandaoknight]

@XiShanYongYe-Chang @windsonsea
I will provide the English version of the document next week and will redraw the images within it, with the text in the images changed to English.

By the way, please take a look at #531,
please change the company name from DSK to Unionbigdata.

Thanks.

[XiShanYongYe-Chang]

Thanks! @pandaoknight
/cc @RainbowMango

[RainbowMango]

/lgtm
/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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