NXCALS-1727 initial structure

docs/index.md

-# Welcome to MkDocs NXCALS site
+# Welcome to NXCALS documentation
 
 ## Chapter 1
-### sub 1.1
-This is a test site.
 
-![About](about.md)
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+```
+Fenced code block example
+```
+
+### sub chapter 1.1
+
+This is a site template.
+
+### sub Chapter 1.2
+
+Link to [About](about.md) page.
+
+Link to ![CERN logo](img/favicon.ico) image.
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docs/user-guide/users-docs.md

+#Users Documentation
+
+## Chapter 1
+
+## Chapter 2
+
+### sub Chapter 2.1
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mkdocs.yml

-site_name: CERN NXCALS Documentation
+site_name: NXCALS Documentation
 pages:
   - Home: index.md
+  - User Guide:
+     - User Documentation: user-guide/users-docs.md
   - About: about.md
+
 theme: readthedocs
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