feat: Add Aspose.BarCode .NET C# Examples — Mailmark Two Dimensional Barcode - #101

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-dotnet@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Possible null reference argument for parameter 'path' in 'DirectoryInfo Directory.CreateDirectory(string path)'.

Converting null literal or possible null value to non-nullable type.

Converting null literal or possible null value to non-nullable type.

Converting null literal or possible null value to non-nullable type.

Converting null literal or possible null value to non-nullable type.

Possible null reference argument for parameter 'other' in 'bool BarcodeCacheKey.Equals(BarcodeCacheKey other)'.

Nullability of reference types in type of parameter 'other' of 'bool BarcodeCacheKey.Equals(BarcodeCacheKey other)' doesn't match implicitly implemented member 'bool IEquatable<BarcodeCacheKey>.Equals(BarcodeCacheKey? other)' (possibly because of nullability attributes).