Add macOS ARM64 (aarch64-apple-darwin) runtime support to NuGet package

[denys-octopus]

The C# bindings NuGet package currently does not include the aarch64-apple-darwin runtime, making it incompatible with Apple Silicon Macs.

Current behaviour

When attempting to use the package on macOS ARM64, the following exception is thrown:

Unhandled exception. System.DllNotFoundException: Unable to load shared library 'regorus_ffi' or one of its dependencies

   at Regorus.Internal.API.regorus_engine_new()
   at Regorus.RegorusEngineHandle.Create()
   at Regorus.Engine..ctor()
   at Program.<Main>$(String[] args) in /test/Program.cs:line 17

Expected behaviour

The NuGet package should include the libregorus_ffi.dylib native library compiled for aarch64-apple-darwin, allowing the package to work natively on Apple Silicon Macs.

Workaround

At the moment we build NuGet package ourselves, including aarch64-apple-darwin runtime target

[anakrish]

@denys-octopus Does #553 address this?

[denys-octopus]

@denys-octopus Does #553 address this?

Yes, that what we did for our workaround 👍
In addition to that we also packed Nuget package with more metadata (license, readme etc.)