Add .gitignore entry for nuget.exe and remove accidentally committed file

Co-authored-by: josesimoes <[email protected]>

Author: Copilot

.gitignore

@@ -259,3 +259,6 @@ paket-files/
 # VS Code
 .vscode/settings.json
 
+
+# Exclude downloaded nuget.exe
+.nuget/nuget.exe