Improved and updated, more clear and readable readme

[ServiAmirPM]

• Split tables per task
• Clear intro, guides
• Add information/Disclaimers, specifically regarding dataset, classes, post-process and accuracy
• removed Levit_128 model (from table + file) due to unsatisfactory performance

[naushir]

@ServiAmirPM can I suggest we start by only updating the models table + removal of the Levit_128 model. While some of the other changes are useful, I would prefer to keep the readme file minimal. We can look into how to change the text minimally on top of this.