Cleanup README.md: Add NuGet badge, consolidate examples, improve clarity

[Copilot]

The README had redundant examples, an overly long feature description, and was missing a NuGet badge for discoverability.

Changes

• Added NuGet badge linking to package (consistent styling with existing badges)
• Fixed Features section - Shortened "Compatible" line from 102 to 78 chars, reordered to place "Multiple Formats" before "Compatible", changed focus from TRX-only to both formats
• Consolidated examples - Merged separate "Creating TRX Files" and "Creating JUnit XML Files" sections into unified "Creating Test Result Files" example demonstrating both formats:

// Create test results once
var results = new TestResults { Name = "SomeTests" };
results.Results.Add(new TestResult { /* ... */ });

// Save to both formats
File.WriteAllText("results.trx", TrxSerializer.Serialize(results));
File.WriteAllText("results.xml", JUnitSerializer.Serialize(results));

• Minor cleanup - Simplified use case description, improved comments for clarity

Net result: 35 fewer lines (242 → 207), better information hierarchy, equal treatment of both supported formats.

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Feature]: Cleanup of README.md</issue_title>
<issue_description>### Problem Statement

The README.md file needs some minor cleanups.

Proposed Solution

1. Add a NuGet badge to the end of the badges which links to the package on NuGet.org.
2. In the Features list, the Compatible line is too long, and also focuses only on TRX files.
3. Merge the "Creating TRX Files" and "Creating JUnit XML Files" into a single example which saves the results to both formats.
4. Possibly look for any other cleanups or improvements.

Alternatives Considered

No response

Usage Examples

Benefits

Improved readability

Priority

Low - Nice to have

Willingness to Contribute

Yes, I can submit a pull request

Additional Context

No response

Checklist

• I have searched existing issues to ensure this is not a duplicate
• I have provided a clear description of the feature
• I have explained why this feature would be useful</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Feature]: Cleanup of README.md #25

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