Adding Warewolf as an open source API management technology

[SalamiArmy]

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

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.