Added header

src/core/soundness+iridescence.scala

@@ -1,3 +1,19 @@
+/*
+    Iridescence, version [unreleased]. Copyright 2024 Jon Pretty, Propensive OÜ.
+
+    The primary distribution site is: https://propensive.com/
+
+    Licensed under the Apache License, Version 2.0 (the "License"); you may not use this
+    file except in compliance with the License. You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software distributed under the
+    License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
+    either express or implied. See the License for the specific language governing permissions
+    and limitations under the License.
+*/
+
 package soundness
 
 export iridescence.{webColors, solarized, Xyz, Rgb12, Rgb24, Rgb32, Srgb, Cielab, Cmy, Cmyk, Hsv,