Improved README: Add output files description

[Ebedthan]

Hi @kmnip,

Thanks for the great tool. I believe the RNA-Bloom would benefit from a README section describing the output files.
I do not have full comprehension of the output files to put a PR but can help if wanted.

Thanks.
Anicet

[kmnip]

Thanks for the suggestion!
I will add a section that primarily describes the final output files for the next release.

[kmnip]

I have added some descriptions in the readme about the final output files.
Please see my new release of RNA-Bloom v2.0.0: https://github.com/bcgsc/RNA-Bloom/releases/tag/v2.0.0

Let me know if you feel more information/clarification is needed. :)