[dotnet] Add dotnet projects and examples

+ Sitemap generator I created while learning the dispose pattern
+ Testing project for learning general C#

dotnet/testing/KlipsLibrary/Bag.cs

@@ -0,0 +1,74 @@
+namespace KlipsLibrary;
+
+public struct Item : IEquatable<Item>
+{
+  public Item(double v, int q, string name)
+  {
+    Value = v;
+    Qty = q;
+    Name = name;
+  }
+
+  public Item(double v, string name)
+  {
+    Value = v;
+    Qty = 1;
+    Name = name;
+  }
+
+  public string Name { get; set; }
+  public double Value { get; set; }
+  public int Qty { get; set; }
+  
+  public static bool operator ==(Item a, Item b)
+  {
+    if (((object)a) == null || ((object)b) == null) return Object.Equals(a, b);
+    return a.Equals(b);
+  }
+
+  public static bool operator !=(Item a, Item b)
+  {
+    return !(a == b);
+  }
+
+  public bool Equals(Item other)
+  {
+    return Name == other.Name && Value == other.Value;
+  }
+
+  public override bool Equals(object? obj)
+  {
+    return obj is Item other && Equals(other);
+  }
+  
+  public override int GetHashCode()
+  {
+    return HashCode.Combine(Name, Value);
+  }
+}
+
+public class Bag
+{
+  public Bag()
+  {
+    contents = new List<Item>();
+    maxCarry = 10;
+  }
+  private List<Item> contents;
+  private int maxCarry;
+
+  public bool AddItem(Item i)
+  {
+    if (contents.Count >= maxCarry) return false;
+    contents.Add(i);
+    return true;
+  }
+
+  public Item? TakeItem(Item i)
+  {
+    var found = contents.Find((Item inBag) => inBag == i);
+    if (found == default(Item)) return null;
+    contents.Remove(found);
+    return found;
+  }
+}