Create requirements.txt

[DeanHnter]

Added a basic requirements file. Its somewhat difficult now to get this project running as installing the latest dependencies leads to package conflicts when pulling the latest version from pypi. I propose adding this as a minimal set of versioned dependencies to make it simpler for those looking to fine-tune CodeT5+ following the guide.

[salesforce-cla[bot]]

Thanks for the contribution! Before we can merge this, we need @DeanHnter to sign the Salesforce Inc. Contributor License Agreement.

[yuewang-cuhk]

你好，你的邮件我已收到，我会尽快查看~~~

[DeanHnter]

I already signed the contributor license and it wont let me re-sign it. It seems the system is broken. When i click view details on the "need to sign the cla" it shows only "Oops, an error occurred" and gives me an ID. So it seems this is blocked until it gets fixed.