Implement remaining exercises for track

[robkeim]

@ErikSchierboom mentioned here that we only have four exercises remaining in the C# track to be implemented:

• error-handling
• forth
• pov
• zipper

There's light at the end of the tunnel :)

[robkeim]

@ErikSchierboom - I'll give error-handling a go

[ErikSchierboom]

@robkeim Cool!

[ErikSchierboom]

@robkeim I'm working on the pov exercise.

[robkeim]

Sounds good @ErikSchierboom!

[ErikSchierboom]

@robkeim I'll probably work on the zipper exercise tonight.

[robkeim]

You're a machine @ErikSchierboom :)

[ErikSchierboom]

We'll, I do have the advantage that I already solved it in F#. That means it's more porting than solving :)

[robkeim]

Fair enough :)

[robkeim]

Thanks @ErikSchierboom, the C# track now has every available exercise implemented 🎉

[ErikSchierboom]

Hurray! Thanks for the great help @robkeim!

@kytrinyx We now have all exercises available in C# too! 🎉