Add wiki recurrence page

[NRG-Drink]

I added the complete recurrence wiki page (.md) in this pr, so we can review an discuss about it but I'm not sure if this is the right way and if it should go on the main branch or not.

content:

• Changed the recurrence examples completely
• Added a test for every wiki example

closes #846

[axunonb]

@NRG-Drink Sorry for the delayed reply. As time allows, I'm currently working on implementing a logger for ical.net.
A logger could make creating the results for the Wiki samples a lot easier. So please let me finish the logger first.

[NRG-Drink]

@NRG-Drink Sorry for the delayed reply. As time allows, I'm currently working on implementing a logger for ical.net. A logger could make creating the results for the Wiki samples a lot easier. So please let me finish the logger first.
@axunonb Thanks for the info. That's no problem :)

[axunonb]

Please see my detailed comments

[axunonb]

The failing unit test are caused by expecting Windows CRLF while the tests run on Ubuntu.
Unit tests should pass an Windows and Linux environments.

Failed DailyIntervalCountMoved [14 ms]
  Error Message:
     Assert.That(occurrenceTestString, Is.EqualTo(expectedOccurrenceDates))
  Expected string length 338 but was 345. Strings differ at index 40.
  Expected: "DTEND;TZID=Europe/Zurich:20250710T100000\nDTSTART;TZID=Europe/..."
  But was:  "DTEND;TZID=Europe/Zurich:20250710T100000\r\nDTSTART;TZID=Europe..."
  ---------------------------------------------------^

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@          Coverage Diff          @@
##            main    #848   +/-   ##
=====================================
  Coverage   67.9%   67.9%           
=====================================
  Files        112     112           
  Lines       4297    4297           
  Branches     973     973           
=====================================
+ Hits        2917    2919    +2     
+ Misses      1037    1035    -2     
  Partials     343     343           

see 2 files with indirect coverage changes

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[axunonb]

@NRG-Drink Not sure about the state of this PR. I think the current main branch should get merged or rebased.
File Ical.Net.Tests/WikiSamples/RecurrenceWiki.md is still included, while it should go to the Wiki repo, right?

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[axunonb]

@NRG-Drink Thanks for preparing the new code samples for the Wiki.
The description can be found at https://github.com/ical-org/ical.net/wiki/Working-with-recurring-elements

[NRG-Drink]

@NRG-Drink Thanks for preparing the new code samples for the Wiki. The description can be found at https://github.com/ical-org/ical.net/wiki/Working-with-recurring-elements

Sorry for my absence on this task and thanks for finishing it. It looks pretty good in the wiki.