DOC: Add sections to documentation

Summary

See https://gitlab.indiscale.com/caosdb/customers/lfpb/management/-/issues/409. Add sections, placeholders for examples, and automatically generated docs to the documentation.

Focus

Verify that the structure makes sense.

Test Environment

Build the documentation as described in README_SETUP.md

Check List for the Author

Please, prepare your MR for a review. Be sure to write a summary and a focus and create gitlab comments for the reviewer. They should guide the reviewer through the changes, explain your changes and also point out open questions. For further good practices have a look at our review guidelines

• All automated tests pass
• Reference related Issues
• [ ] Up-to-date CHANGELOG.md
• Annotations in code (Gitlab comments)
  • Intent of new code
  • Problems with old code
  • Why this implementation?

Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• [ ] Up-to-date CHANGELOG.md
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
• Check: Are there spezifications? Are they satisfied?

For further good practices have a look at our review guidelines.

README_SETUP.md

@@ -44,6 +44,26 @@ julia> ]activate "/path/to/caosdb-julialib"
 julia> ]test
 ```
 
+## Code styling
+
+We use
+[JuliaFormatter.jl](https://github.com/domluna/JuliaFormatter.jl) for
+automatic code formatting.  Simply install JuliaFormatter by
+
+```julia-repl
+julia> ]add JuliaFormatter
+```
+
+and execute 
+
+```sh
+julia -e 'using JuliaFormatter; format(".", verbose=true)'
+```
+
+in the root directory of caosdb-julialib. You may leave out the
+`verbose=true` option if you do not wish to see which files were
+formatted.
+
 ## Documentation
 
 The documentation can be built locally using