### _Why are the changes needed?_
Add quick start documents of the Flink SQL Engine.
### _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
- [x] [Run test](https://kyuubi.apache.org/docs/latest/develop_tools/testing.html#running-tests) locally before make a pull request
Closes#2106 from deadwind4/KYUUBI-1866-quickstart.
Closes#1866
2533aafd [Ada Wong] remove Yarn section
6aa4db8a [Ada Wong] compress png
ff6bff72 [Ada Wong] [KYUUBI #1866][DOCS] Add flink sql engine quick start
Authored-by: Ada Wong <rsl4@foxmail.com>
Signed-off-by: Kent Yao <yao@apache.org>