maint: add AUTHORS and CONTRIBUTORS.md (#219)

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

Author: jorgepiloto

AUTHORS

@@ -0,0 +1,12 @@
+# This is the list of PyDYNA'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 wish to be added to this file
+# please submit a request.
+#
+#
+ANSYS, Inc.

AUTHORS.md renamed to CONTRIBUTORS.md

@@ -1,6 +1,6 @@
-# Authors
+# Contributors
 
-## Contributors
+## Individual contributors
 
 * [Zhanqun Zhang](https://github.com/zhangzhanqun)
 * [Wenhui Yu](https://github.com/wenhuiuy)