Added API Testing tools

Alternatives to Postman what can help you out.

MindAPI.md

@@ -592,3 +592,10 @@
 - Old or previous API versions are running unpatched.
 - The aspects of the API (e.g. authentication, endpoints, redirects, errors, parameters, rate-limiting, request and response formats, etc) are missing or outdated.
 - If the API documentation is exposed to the internet, implement an access control mechanism (e.g. login portal) to ensure that only authorized users access the OpenAPI specification or even to the documentation as a whole.
+
+### API Testing tools
+- [Postman](https://www.postman.com/downloads/)
+- [Bruno](https://www.usebruno.com/downloads)
+- [Insomnia](https://insomnia.rest/products/insomnia)
+- [HTTPie](https://httpie.io)
+- [Hoppscotch](https://hoppscotch.io/)