add MkDocs

Signed-off-by: Michel-FK <michel.stempin@funkey-project.com>

.github/workflows/ci.yml

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+name: ci
+on:
+  push:
+    branches:
+      - source
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          python-version: 3.x
+      - run: pip install mkdocs-material
+      - run: mkdocs gh-deploy --force --remote-branch master

docs/index.md

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+# 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

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+site_name: FunKey Project Documentation
+theme:
+  name: material
+  logo: assets/images/logo.png
+  favicon: assets/favicon.png
+  palette:
+    primary: deep purple