Improve readme formatting and add information on Initiative 31 #1580

[HeikoKlare]

This enhances the readme in the following ways:

• Use consistent markdown formatting throughout the document and change all headlines to title case
• Add a section on prototyping work for a single, OS-agnostic SWT implementation with links to the according prototype repositories (Initiative 31)

Fixes #1580

[github-actions]

Test Results

   483 files  ±0     483 suites  ±0   8m 43s ⏱️ - 3m 51s
 4 095 tests ±0   4 085 ✅ ±0   7 💤 ±0  3 ❌ ±0 
16 173 runs  ±0  16 080 ✅ ±0  90 💤 ±0  3 ❌ ±0 

For more details on these failures, see this check.

Results for commit e8fc11b. ± Comparison against base commit e6588c2.

♻️ This comment has been updated with latest results.

[vogella]

LGTM, I personally would have split the new header styling from the new text but having it together is also fine for me.

[vogella]

In the Skia link it points to https://github.com/JetBrains/skija which says it is not maintained anymore,

[HeikoKlare]

In the Skia link it points to https://github.com/JetBrains/skija which says it is not maintained anymore,

Thank you! I have adapted the link to refer to the current Skija implementation (which has been forked out of the linked one).

I personally would have split the new header styling from the new text but having it together is also fine for me.

Agreed. I have now at least split up the commit into two.

[akurtakov]

Merging this one.