Create user guide for basic application usage and testing

[halcwb]

Issue Description

Create user guide for basic application usage without requiring patient data in query string.

Questions from @draptick

1. Can the application be used without passing patient data in the query string at http://localhost:5173?
2. What is a simple reproducible workflow for testing unit conversions?
3. Where should users click and which fields should be modified for basic testing?

Suggested Documentation

Create a user guide covering:

• Basic application navigation
• Testing workflows without patient data
• Unit conversion testing procedures
• Step-by-step tutorials for common use cases
• Field explanations and expected inputs

Target Audience

• New developers during onboarding
• Users testing the application
• QA testing procedures

Related

Part of onboarding feedback from @draptick

[halcwb]

@draptik

There are some user guides:

• Emergency list and Standard infusion pumps functionality: https://picuwkz.nl/de-genpres-noodlijst/
• Prescribe and drug dosing functionality: https://picuwkz.nl/genpres-medicatie-controle/

The guides have a language banner. Only the figures and animations will remain in Dutch