Added documentation about SWT's Coordinate System

[amartya4256]

This PR adds the documentation about SWT's new Coordinate system which aids to the monitor specific scaling on windows.

[github-actions]

Test Results

  176 files  + 7    176 suites  +7   27m 12s ⏱️ - 2m 53s
4 684 tests +57  4 662 ✅ +55  22 💤 +3  0 ❌  - 1 
  485 runs  +57    479 ✅ +54   6 💤 +3  0 ❌ ±0 

Results for commit 51e0349. ± Comparison against base commit 9acbc6f.

♻️ This comment has been updated with latest results.

[HeikoKlare]

Having documentation of the coordinate system specifics is a good idea. Thank you.

The current text more sounds like an experience report / article than a documentation of results. It also does align with the terminology in the rest of the documentation. Can we align that?
As an example, the documentation introduced the "static" and the "dynamic" HiDPI support, for which the different coordinate system apply. So explaining the relation between those terms of the different coordinate system would be helpful. Actually, the current description is not completely correct in that regard, as it states that when all monitors have the same zoom, the SingleZoomCoordinateSystemMapper is used, but it only depends on the used HiDPI mode and not on the zooms of the monitors.

The images are also quite nice, but in my opinion they would be more helpful if they reflected how the coordinate systems actually work and not how a wrong coordinate system would look like.

[HeikoKlare]

Only changing docs, which are not checked by CI. Thus merging before CI is done.