Write out the high-level API I need.

SpaceWizards.Sodium/SodiumInitException.cs

@@ -0,0 +1,17 @@
+namespace SpaceWizards.Sodium;
+
+[Serializable]
+public sealed class SodiumInitException : Exception
+{
+    public SodiumInitException()
+    {
+    }
+
+    public SodiumInitException(string message) : base(message)
+    {
+    }
+
+    public SodiumInitException(string message, Exception inner) : base(message, inner)
+    {
+    }
+}