chore: Add ACKNOWLEDGMENTS.md file (#1214)

* chore: Add ACKNOWLEDGMENTS.md file

* chore: Add note to say the list is unmaintained

* chore: Add list of contributors from GitHub issues

* chore: Replace datatracker URL with rfc-editor URL

Author: kesara

ACKNOWLEDGMENTS.md

@@ -0,0 +1,60 @@
+# Acknowledgements
+
+`xml2rfc` was originally created in 1999 by Marshall Rose who presented an XML
+markup language for RFCs and Internet-Drafts[^1]. The current implementation of
+the `xml2rfc` was originally authored by Henrik Levkowetz.
+
+Here is an inevitably incomplete and unmaintained list of much appreciated
+contributors:
+
+ - Marshall Rose
+ - Henrik Levkowetz
+ - Josh Bothun
+ - Kesara Rathnayake
+ - Robert Sparks
+ - Wiggins
+ - Tony Hansen
+ - Jim Schaad
+ - Nicolas Giard
+ - Julian Reschke
+ - Martin Thomson
+ - Carsten Bormann
+ - Jennifer Richards
+ - Florian Schmaus
+ - Daniel Kahn Gillmor
+ - Benson Muite
+ - Josh Soref
+ - Justus Winter
+ - Scott Kitterman
+ - Jean Mahoney
+ - Alice Russo
+ - Asbjørn Ulsberg
+ - Kent Watsen
+ - Madison Church
+ - Lynne Bartholomew
+ - Tom Haynes
+ - Alanna Paloma
+ - Sandy Ginoza
+ - Sarah Tarrant
+ - John Scudder
+ - Paul Hoffman
+ - Mark Nottingham
+ - Rahul Gupta
+ - Bob Hinden
+ - John Preuß Mattsson
+ - Rebecca VanRheenen
+ - John C Klensin
+ - Randy Bush
+ - Florian Schmaus
+ - Adrian Farrel
+ - Valery Smyslov
+ - Bill P. Godfrey
+ - Miek Gieben
+ - Benoît Claise
+ - Lars Eggert
+ - John Levine
+ - David von Oheimb
+ - Brian E Carpenter
+ - Robert Kieffer
+
+[^1]: https://www.rfc-editor.org/rfc/rfc2629

pyproject.toml

@@ -5,8 +5,7 @@ description = "xml2rfc generates RFCs and IETF drafts from document source in XM
 readme = "README.md"
 requires-python = ">=3.9"
 license = {file = "LICENSE"}
-authors = [{name = "Henrik Levkowetz"}]
-maintainers = [{name = "IETF Tools", email = "tools-help@ietf.org"}]
+authors = [{name = "IETF Tools", email = "tools-help@ietf.org"}]
 keywords = ["ietf", "rfc", "id", "internet-draft", "xml", "xml2rfc", "xmlrfc"]
 classifiers = [
     "Development Status :: 5 - Production/Stable",