Add Powered By Page

[yaooqinn]

Make our work count and encourage people to share their brief stories with Kyuubi.
For example, http://spark.apache.org/powered-by.html

I guess this is the right way to better marketing.

cc @pan3793 @Honglun @turboFei @MyLanPangzi @ulysses-you

[yangrong688]

I think we can also refer to who uses apache airflow page, to let people make a pr with their company names and @githubhandle.