Add benchmark README for ChatQnA (#662)

* Add benchmark README for ChatQnA

Signed-off-by: lvliang-intel <liang1.lv@intel.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* add benchmark.yaml

Signed-off-by: lvliang-intel <liang1.lv@intel.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* update yaml path

Signed-off-by: lvliang-intel <liang1.lv@intel.com>

* fix preci issue

Signed-off-by: lvliang-intel <liang1.lv@intel.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* update title

Signed-off-by: lvliang-intel <liang1.lv@intel.com>

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Signed-off-by: lvliang-intel <liang1.lv@intel.com>
Signed-off-by: Yingchun Guo <yingchun.guo@intel.com>

Author: lvliang-intel