feat: started article about mitmproxy

knowledge base/mitmproxy.md

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+# `mitmproxy`
+
+Free and open source set of tools which provide an interactive, SSL/TLS-capable intercepting proxy for HTTP/1, HTTP/2, and WebSockets.
+
+## Table of contents <!-- omit in toc -->
+
+1. [TL;DR](#tldr)
+1. [Further readings](#further-readings)
+1. [Sources](#sources)
+
+## TL;DR
+
+```sh
+# Installation.
+brew install 'mitmproxy'
+```
+
+## Further readings
+
+- [Website]
+- [Documentation]
+
+## Sources
+
+All the references in the [further readings] section, plus the following:
+
+<!-- project's references -->
+[documentation]: https://docs.mitmproxy.org/stable/
+[website]: https://mitmproxy.org/
+
+<!-- in-article references -->
+[further readings]: #further-readings
+
+<!-- internal references -->
+<!-- external references -->