Add IBufferWriter<byte>.AsStream(). Add MemoryStream.AsIBufferWriter() Add byte[].AsStream(). Add List<T>.AsMemory() and .AsSpan(). Add PickFirstEnumerator<T>. Move SystemExtensions.System.FIle to SystemExtensions.System.IO.File. Update README.md
Add IBufferWriter<byte>.AsStream(). Add MemoryStream.AsIBufferWriter() Add byte[].AsStream(). Add List<T>.AsMemory() and .AsSpan(). Add PickFirstEnumerator<T>. Move SystemExtensions.System.FIle to SystemExtensions.System.IO.File. Update README.md