Add Bytescale

[fmerian]

• Bytescale - File storage and processing APIs.

checklist

Please make sure you've complied with the contribution guidelines:

• [x] The homepage clearly states that the product is for developers.

  "Headless", "API-First", "SaaS" are frequently used keywords. Usually this means that the front page has some code examples :)

• [x] The product is available now and requires payment.
• [x] The PR has a descriptive title -- e.g., Add {Product}, not Update README.md.
• [x] The new submission isn't a duplicate.
• [x] The entry has a description, is sorted alphabetically, and ends with a full stop.

Thanks!