<!--
Thanks for sending a pull request!

Here are some tips for you:
  1. If this is your first time, please read our contributor guidelines: https://kyuubi.readthedocs.io/en/latest/community/contributions.html
  2. If the PR is related to an issue in https://github.com/apache/incubator-kyuubi/issues, add '[KYUUBI #XXXX]' in your PR title, e.g., '[KYUUBI #XXXX] Your PR title ...'.
  3. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP][KYUUBI #XXXX] Your PR title ...'.
-->

### _Why are the changes needed?_
<!--
Please clarify why the changes are needed. For instance,
  1. If you add a feature, you can talk about the use case of it.
  2. If you fix a bug, you can clarify why it is a bug.
-->
- Add release script
- Add release guide
- Add license header in some files

### _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/tools/testing.html#running-tests

) locally before make a pull request

The release script has not been tested yet.

Closes #874 from pan3793/asf-pub.

Closes #874

5e798a96 [Cheng Pan] LICENSE header
825f2a84 [Cheng Pan] Fix rat
aecc3e6b [Cheng Pan] release doc
a55503c5 [Cheng Pan] Kyuubi Release Guide
2f1a25a2 [Cheng Pan] Release Guide
c5a40c24 [Cheng Pan] Release script
Authored-by: Cheng Pan <chengpan@apache.org>
Signed-off-by: Cheng Pan <chengpan@apache.org>