remove TODO and update README.md in tests

# pytest.ini

# note: per convention, this file is placed in the root directory of the repository

[pytest]

# TODO remove ignore after tests are harmonized

addopts = --tb=short -n auto -v

# Write captured system-out log messages to JUnit report.

junit_logging = system-out

# - IVAS_cod_ref(.exe)

# - IVAS_dec_ref(.exe)

# pytest command lines to be executed from project root folder:

pytest tests --update_ref 1 -m create_ref

pytest tests --update_ref 1 -m create_ref_part2

pytest tests/codec_be_on_mr_nonselection --update_ref 1 -m create_ref

pytest tests/codec_be_on_mr_nonselection --update_ref 1 -m create_ref_part2

```

## Running the tests