### What this PR does / why we need it?
v0.11.0rc1 will introduce w4a4 quantization feature, so add this
tutorial.
### Does this PR introduce _any_ user-facing change?
No
- vLLM version: v0.11.0
- vLLM main:
83f478bb19
Signed-off-by: 22dimensions <waitingwind@foxmail.com>