chore: added article for conventional commits and started using them

knowledge base/conventional commits.md

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+# Conventional commits
+
+Lightweight convention on top of commit messages.<br/>
+It provides an easy set of rules for creating an explicit commit history.
+
+## Table of contents <!-- omit in toc -->
+
+1. [TL;DR](#tldr)
+1. [Further readings](#further-readings)
+
+## TL;DR
+
+A commit message should be structured as follows:
+
+```text
+<type>[optional scope]: <description>
+
+[optional body]
+
+[optional footer(s)]
+```
+
+## Further readings
+
+- [Website]
+
+<!-- project's references -->
+[website]: https://www.conventionalcommits.org