Add project files.

RPGLibrary.Implementation/Attribute/DefenseAttribute.cs

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+using RPGLibrary.Abstraction.Attribute;
+
+namespace RPGLibrary.Implementation
+{
+  public class DefenseAttribute : IAttribute
+  {
+    public DefenseAttribute(double value)
+    {
+      Value = value;
+    }
+
+    public double Value { get; }
+
+    public override string? ToString()
+    {
+      return $"Defense: {Value}";
+    }
+  }
+
+}

RPGLibrary.Implementation/Attribute/HP.cs

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+using RPGLibrary.Attribute;
+
+namespace RPGLibrary.Implementation
+{
+  public class HP : PoolAttribute
+  {
+    public HP(double current, double maximum)
+    : base(current, maximum)
+    {
+    }
+
+    public override string? ToString()
+    {
+      return $"HP: ({Value}/{Maximum})";
+    }
+  }
+
+}

RPGLibrary.Implementation/Attribute/Speed.cs

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+namespace RPGLibrary.Implementation
+{
+  public class Speed
+  {
+    public Speed(double value)
+    {
+      Value = value;
+    }
+
+    public double Value { get; }
+  }
+
+}

RPGLibrary.Implementation/Attribute/StrengthAttribute.cs

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+using RPGLibrary.Abstraction.Attribute;
+
+namespace RPGLibrary.Implementation
+{
+  public class StrengthAttribute : IAttribute
+  {
+    public StrengthAttribute(double value)
+    {
+      Value = value;
+    }
+
+    public double Value { get; }
+
+    public override string? ToString()
+    {
+      return $"Strength: {Value}";
+    }
+  }
+
+}