docs: add auto-generated mkdocs files

Add the auto-generated MkDocs files, created by running `mkdocs new
git-template`, to this repository.

docs/index.md

@@ -0,0 +1,17 @@
+# Welcome to 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.

mkdocs.yml

@@ -0,0 +1 @@
+site_name: git-template