Add mandatory AUTHORS file (#715)

* Add mandatory AUTHORS file

* Update AUTHORS

---------

Co-authored-by: Roberto Pastor Muela <[email protected]>

Author: PProfizi

AUTHORS

@@ -0,0 +1,12 @@
+# This is the list of PyDPF-Post's significant contributors.
+#
+# This file does not necessarily list everyone who has contributed code.
+#
+# For contributions made under a Corporate CLA, the organization is
+# added to this file.
+#
+# If you have contributed to the repository and want to be added to this file,
+# submit a request.
+#
+#
+ANSYS, Inc.