Small optimization patch

A small patch, but why not release it now already.

• Drastically reduced file size, using compression. For anyone interested, here's the command used now: dotnet publish -r win-x64 -c Release /p:PublishSingleFile=true /p:EnableCompressionInSingleFile=true /p:IncludeAllContentForSelfExtract=true
• More detailed welcome message

Tag movement has happened, real commit is 99df95e - though the only thing that has happened since is a README.md change.

The app has a very long first launch time, may take ~20 seconds before anything appears. No idea what causes it, but it might be with the form of packaging.

Please open an issue on GitHub if you encounter any other problems

First release

A little unfinished, but I guess it's usable.
A few more features are planned yet.

Tag movement has happened, sorry, I'm not good at GitHub! Real commit is f1c2645