docs: add guide for starting MkDocs locally

docs/README

@@ -0,0 +1,27 @@
+# Welcome to MkDocs
+
+Install MkDocs - https://www.mkdocs.org/#installing-mkdocs
+
+For full documentation visit [mkdocs.org](https://www.mkdocs.org).
+
+## Commands
+
+* `mkdocs new [dir-name]` - Create a new project.
+* `mkdocs serve` - Start the live-reloading docs server.
+* `mkdocs build` - Build the documentation site.
+* `mkdocs -h` - Print help message and exit.
+
+## Project layout
+
+    mkdocs.yml    # The configuration file.
+    docs/
+        index.md  # The documentation homepage.
+        ...       # Other markdown pages, images and other files.
+
+Useful links:
+
+- Material for MkDocs
+https://squidfunk.github.io/mkdocs-material/
+
+- Admonitions (tip, warning, info boxes)
+https://squidfunk.github.io/mkdocs-material/reference/admonitions/