Added Postman's notes to the knowledge base

knowledge base/newman.md

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+# Newman <!-- omit in toc -->
+
+CLI Collection runner for Postman.
+
+## Further readings
+
+- [Postman]
+- [Running Collections on the command line with Newman]
+
+<!-- internal knowledge base -->
+[postman]: postman.md
+
+<!-- projects' references -->
+[running collections on the command line with newman]: https://learning.postman.com/docs/running-collections/using-newman-cli/command-line-integration-with-newman/

knowledge base/postman.md

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+# Postman <!-- omit in toc -->
+
+API platform for building and using APIs.
+
+## Further readings
+
+- [Website]
+- [Documentation]
+- [Insomnia], an alternative to Postman
+- [Newman], CLI Collection runner for Postman
+
+<!-- internal knowledge base -->
+[insomnia]: insomnia.md
+[newman]: newman.md
+
+<!-- projects' references -->
+[documentation]: https://learning.postman.com/docs
+[website]: https://www.postman.com/