C# - Added get and set keywords

In C#, you can write something like:

    public class SomeClass
    {
        int _somevalue;
        public int SomeProperty
        {
            get
            {
                return _someValue;
            }
            set
            {
                _someValue = value;
            }
        }
    }

This adds support for `get` and `set` in this example.

Improves the problem explained in #149 as well.