### _Why are the changes needed?_
Umbrella issue #915 is finished. Document is needed to tell user how to enable it.
### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible
- [ ] Add screenshots for manual tests if appropriate
- [ ] [Run test](https://kyuubi.readthedocs.io/en/latest/develop_tools/testing.html#running-tests) locally before make a pull request
Closes#1101 from zhouyifan279/KYUUBI#1090.
Closes#1090
fdd4da8a [zhouyifan279] [KYUUBI #1090] Add deployment document about Hadoop Credentials Manager
418da1dc [zhouyifan279] [KYUUBI #1090] Add deployment document about Hadoop Credentials Manager
0e8e44ba [zhouyifan279] [KYUUBI #1090] Add deployment document about Hadoop Credentials Manager
Authored-by: zhouyifan279 <zhouyifan279@gmail.com>
Signed-off-by: Kent Yao <yao@apache.org>
