Docs: Added README and contributing guide (#124)

Co-authored-by: Burer <burer@kolibrios.org>
Reviewed-on: KolibriOS/kolibrios#124
Reviewed-by: Burer <burer@kolibrios.org>
Reviewed-by: rgimad <rgimad@noreply.localhost>
Reviewed-by: Ivan B <dunkaist@noreply.localhost>
Reviewed-by: Sweetbread <risdeveau@codrs.ru>

README.md

@@ -0,0 +1,22 @@
+# KolibriOS
+
+[![License](https://img.shields.io/badge/License-GPL%202.0-green)](./COPYING.TXT)
+[![Build system](https://git.kolibrios.org/KolibriOS/kolibrios/actions/workflows/build.yaml/badge.svg)](https://git.kolibrios.org/KolibriOS/kolibrios/actions)
+
+KolibriOS is a hobby operating system for x86-compatible computers, which is currently being developed by a small but passionate team of enthusiasts.
+
+Its kernel, most drivers, and many programs are written entirely in [FASM](https://flatassembler.net/) assembly language, making them very compact and lean on system resources.
+
+Based on [MenuetOS](https://www.menuetos.net/), it uses its own standards and is NOT fully POSIX or UNIX compliant.
+
+## Contributing
+
+We would appreciate any participation in the project and always welcome new users and contributors.
+
+Detailed instructions for the contribution process can be found in the [contributing guide](./CONTRIBUTING.md).
+
+Common list of tasks, issues and enhancement proposals can be found on [this page](https://git.kolibrios.org/KolibriOS/kolibrios/issues).
+
+## Special thanks
+
+The KolibriOS team expresses special thanks to the author of the 32-bit **MenuetOS**, [Ville Turjanmaa](https://www.menuetos.net/contact.htm). We also want to note that all **MenuetOS** copyrights have been preserved.