Initial work on implementing Pokemon

PkmnLib.Static/Libraries/GrowthRateLibrary.cs

@@ -24,7 +24,38 @@ public interface IReadOnlyGrowthRateLibrary
     /// Whether the library is empty.
     /// </summary>
     bool IsEmpty { get; }
+    
+    /// <summary>
+    /// Calculates the experience for a given growth key name and a certain level.
+    /// </summary>
+    uint CalculateExperience(StringKey key, LevelInt level);
+    
+    /// <summary>
+    /// Calculates the level for a given growth key name and a certain experience.
+    /// </summary>
+    LevelInt CalculateLevel(StringKey key, uint experience);
 }
 
 /// <inheritdoc cref="IReadOnlyGrowthRateLibrary"/>
-public class GrowthRateLibrary : DataLibrary<IGrowthRate>, IReadOnlyGrowthRateLibrary;
+public class GrowthRateLibrary : DataLibrary<IGrowthRate>, IReadOnlyGrowthRateLibrary
+{
+    /// <inheritdoc />
+    public uint CalculateExperience(StringKey key, LevelInt level)
+    {
+        if (!TryGet(key, out var growthRate))
+        {
+            throw new KeyNotFoundException($"Growth rate {key} not found.");
+        }
+        return growthRate.CalculateExperience(level);
+    }
+
+    /// <inheritdoc />
+    public LevelInt CalculateLevel(StringKey key, uint experience)
+    {
+        if (!TryGet(key, out var growthRate))
+        {
+            throw new KeyNotFoundException($"Growth rate {key} not found.");
+        }
+        return growthRate.CalculateLevel(experience);
+    }
+}