Added some resources from Permit.io

[danielbass37]

Added Permit.io as a platform, as well as an article about "Best Practices for Microservice Authorization".

Type of change

• Add an entry to an existing category.
• Remove an existing entry. Provide rationale
• Modify an existing entry. Provide rationale
• Add/modify/remove a category or subcategory. Provide rationale
• Other fixes or amendments.

Rationale

Added some resources from Permit.io

Checklist

• The contribution follows the CONTRIBUTING.md document guidelines.

Regarding the suggested entry:

• It is sorted alphabetically in its section.
• It does not exist already in the list.
• It is not for marketing purposes.

[danielbass37]

@andrzejsydor thanks for the review mate! Anything else I need to do to get this merged?