Add guide for installing Apache APISIX on KubeSphere

[moonming]

@lilien1010 shared a related topic on Apache APISIX DevCon, can it be synchronized to the document?
thx

[lilien1010]

more like a case study for users
https://kubesphere.com.cn/case/
But already I post it in KubeSphere community,

[FeynmanZhou]

more like a case study for users
https://kubesphere.com.cn/case/
But already I post it in KubeSphere community,

No. I assume there should be a deployment guide of installing Apache APISIX on KubeSphere. See Install Install Gitlab on KubeSphere as an example.

[lilien1010]

Can we name APISIX as Built-in Applications now?
which I think we can post in this directory /docs/application-store/built-in-apps/apisix-app/.
sounds good to you ? @FeynmanZhou

[FeynmanZhou]

Can we name APISIX as Built-in Applications now?
which I think we can post in this directory /docs/application-store/built-in-apps/apisix-app/.
sounds good to you ? @FeynmanZhou

Yes, but I think it can be released as a built-in app with v3.1.0 out. For v3.0.0, users can install APISIX on KubeSphere by importing a Helm repo.