Move solution and projects to src

src/Spv.Generator/DeterministicStringKey.cs

@@ -0,0 +1,30 @@
+using System;
+using System.Diagnostics.CodeAnalysis;
+
+namespace Spv.Generator
+{
+    internal class DeterministicStringKey : IEquatable<DeterministicStringKey>
+    {
+        private string _value;
+
+        public DeterministicStringKey(string value)
+        {
+            _value = value;
+        }
+
+        public override int GetHashCode()
+        {
+            return DeterministicHashCode.GetHashCode(_value);
+        }
+
+        public bool Equals(DeterministicStringKey other)
+        {
+            return _value == other._value;
+        }
+
+        public override bool Equals([NotNullWhen(true)] object obj)
+        {
+            return obj is DeterministicStringKey && Equals((DeterministicStringKey)obj);
+        }
+    }
+}