Remove references to README.nuget.md

[guibranco]

NuGet gallery now shows the WakaTime badge (It was added to trusted domains list). No need of specific readme file for it

[codacy-production[bot]]

Coverage summary from Codacy

Merging #40 (2bf01729aa4257a79ebe45aa572ebe6698c1b44d) into main (17ffd8d6ee32a90a508e2b919c0ed5722d4e0295) - See PR on Codacy

Coverage variation	Diff coverage
+0.00%	∅

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (17ffd8d6ee32a90a508e2b919c0ed5722d4e0295) | 75 | 1 | 1.33% | | | Head commit (2bf01729aa4257a79ebe45aa572ebe6698c1b44d) | 75 (+0) | 1 (+0) | 1.33% (**+0.00%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#40) | 0 | 0 | **∅ (not applicable)** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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