Update who-is-using.md

[Juandavi1]

We are using this great project in Siigo.com, it has worked very well and we would like to appear in the companies that use it.

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[fgparamio]

We are using this great project in Siigo.com, it has worked very well and we would like to appear in the companies that use it.

Totally true. It avoids us consuming unnecessary resources with other tools such as Databricks. The operation is perfect with
spark-on-k8s-operator. In Siigo we broadcast about half a million kafka events in less than a second. Thank you very much Juanda

[liyinan926]

@Juandavi1 Thanks for the PR! Will merge once the CLA is signed.

[liyinan926]

@Juandavi1 if you are still willing to get this PR submitted, please sign the CLA so I can merge it. Thanks!

[Juandavi1]

Hi,

the CLA has been submitted.

Thanks