Add first MkDocs skeleton

docs/index.md

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+# Welcome to MkDocs
+
+For full documentation visit [mkdocs.org](http://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 help` - Print this help message.
+
+## Project layout
+
+    mkdocs.yml    # The configuration file.
+    docs/
+        index.md  # The documentation homepage.
+        ...       # Other markdown pages, images and other files.

mkdocs.yml

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+site_name: NodeMCU Documentation
+site_description: Description of the NodeMCU documentation
+theme: readthedocs
+pages:
+- ['index.md', 'Index']