Add new testing tools to the list (Hacktoberfest accepted) :loudspeaker:

[Zoran Pandovski]

Before adding a new testing tool, please follow the contributing guide:

• Search previous suggestions before making a new one, as yours may be a duplicate.
• Make an individual pull request for each suggestion.
• Chose the corresponding section.
• New categories or improvements to the existing categorization are welcome.
• Research if the tool you're including is actually awesome and useful.
  Thanks 🕵️‍♀️ 🕵️‍♂️