update readme

Author: olegantonyan

README.md

@@ -1,2 +1,24 @@
 [![Publish docs via GitHub Pages](https://github.com/omnipackage/omnipackage-docs/actions/workflows/release-gh-pages.yml/badge.svg)](https://github.com/omnipackage/omnipackage-docs/actions/workflows/release-gh-pages.yml)
 [![pages-build-deployment](https://github.com/omnipackage/omnipackage-docs/actions/workflows/pages/pages-build-deployment/badge.svg)](https://github.com/omnipackage/omnipackage-docs/actions/workflows/pages/pages-build-deployment)
+
+# OmniPackage documentation
+
+Created with [mkdocs](https://www.mkdocs.org) and [mkdocs-material](https://squidfunk.github.io/mkdocs-material)
+
+Install dependencies:
+
+```shell
+make deps
+```
+
+Run with live reload:
+
+```shell
+make serve
+```
+
+Build static site (output in `site/`):
+
+```shell
+make build
+```