docs: init mdbook

.github/workflows/docs.yml

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+name: Deploy to Github-Pages
+
+on:
+  push:
+    branches: ["main"]
+    paths: ["docs/**"]
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: mdBook Action
+        uses: peaceiris/actions-mdbook@v1
+
+      - run: mdbook build
+
+      - name: Deploy
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./book
+

book.toml

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+[book]
+authors = ["M.Schoenenberg, D.Hommen"]
+language = "en"
+multilingual = false
+src = "docs"
+title = "Documentation"

docs/SUMMARY.md

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+# Summary
+
+- [Installation]()
+- [Use]()
+- [Developing]()