Ragaaf - updated readme (#178)

* small fix for ragas.py

Signed-off-by: aasavari <[email protected]>

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

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

* fixed error when metrics arg is used

Signed-off-by: aasavari <[email protected]>

* updated README

Signed-off-by: aasavari <[email protected]>

* added key features

Signed-off-by: aasavari <[email protected]>

* edited formatting

Signed-off-by: aasavari <[email protected]>

* improved readability

Signed-off-by: aasavari <[email protected]>

* improved note in model section

Signed-off-by: aasavari <[email protected]>

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

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

* spell check

Signed-off-by: aasavari <[email protected]>

---------

Signed-off-by: aasavari <[email protected]>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>