Added acknowledgement file

Author: nimgould

doc/README.thanks

@@ -0,0 +1,26 @@
+We are grateful to the following people for their
+suggestions, bug fixes and additional interfaces.
+
+ Jari Fowkes
+ Philip Gill
+ William Hager
+ Julian Hall
+ Christoph Hansknecht
+ Marcel Jacobse
+ Romana Jezek
+ Alexis Montoison
+ Todd Munson
+ Lindon Roberts
+ Hugo Scolnik
+ Andreas Waechter
+ Richard Waltz
+
+If we have forgotten anyone, sorry! please contact us,
+and we will update our list.
+
+Nick Gould
+Dominique Orban
+Philippe Toint
+
+For GALAHAD productions
+21st August 2023