Improved README.md and added Examples

[Bibyutatsu]

Hi insilicomedicine,
I have tried updating the Readme file to include more detailed instructions on the installation and running of the model. I have also tried to give some explanation based on my understanding of the model and examples along with some examples of the output images.
Please consider this for the community as I have many colleagues and friends who had hard time running your amazing model.

In the future I am thinking of doing these:

1. Updating the pretrain.ipynb with detailed explanations regarding the steps and significance of the numbers for the different variables.
2. Trying to explain the train_vaelp() and train_rl() functions in detail.
3. Add some explanation regarding how to change the gentrl tokenizer and encoder for custom datasets and tokens.

Thank you
I hope you consider my request

[danpol]

Also, remove changes related to GENTRL pipeline image (both pdf and png), as they seem to be unchanged

[Bibyutatsu]

Hi, I have made all the changes. Please review it.

[Bibyutatsu]

Hi, Can you please review my changes and merge the pull request.

[gilnahmias]

Note a missing comma at setup.py, line 14 as per https://youtu.be/ya3AdrfKYzc?t=2470

[Bibyutatsu]

All the changes incorporated