Move solution and projects to src

src/ARMeilleure/Decoders/InstDescriptor.cs

@@ -0,0 +1,18 @@
+using ARMeilleure.Instructions;
+
+namespace ARMeilleure.Decoders
+{
+    readonly struct InstDescriptor
+    {
+        public static InstDescriptor Undefined => new InstDescriptor(InstName.Und, InstEmit.Und);
+
+        public InstName    Name    { get; }
+        public InstEmitter Emitter { get; }
+
+        public InstDescriptor(InstName name, InstEmitter emitter)
+        {
+            Name    = name;
+            Emitter = emitter;
+        }
+    }
+}