Corrections to the requirements.txt and README

[FauzanFarooqui]

• Two missing packages were added in the requirements.txt - tqdm and PyYAML.
• Pandas version is downgraded to the version right before 2.0.0, as the new v2.0 no longer supports df.concat
• The correct git clone link is updated in the README
• Example for the evaluation command is corrected to include the config file
• Some more explanation / example regarding passing the config file while training and the resume option is included.