CORE-4643: add contributors list as place holder for open sourcing (#373)

* CORE-4643 add contributors

Author: ronanbrowne

CONTRIBUTORS.md

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+# List of Contributors
+
+We'd like to thank the following people for contributing to Corda, either by
+contributing to the design of Corda during the architecture review sessions of the
+R3 Architecture Working Group and during design reviews since Corda has been
+open-sourced, or by contributing code via pull requests. Some people have
+moved to a different organisation since their contribution. Please forgive any
+omissions, and create a pull request if you wish to
+see changes to this list.
+
+* Adel El-Beik (R3)
+* Alan Barclay (R3)
+* Alexey Kadyrov (R3)
+* Andrei Palade (R3)
+* Barry Lapthorn (R3)
+* Ben McMahon (R3)
+* Charlie Crean (R3)
+* Chris Rankin (R3)
+* Christian Sailer (R3)
+* Conal Smith (R3)
+* Connel McGovern (R3)
+* Dan Newton (R3)
+* Dimos Raptis (R3)
+* Dries Samyn (R3)
+* Florian Friemel (R3)
+* James Higgs (R3)
+* Joel Dudley (R3)
+* Joseph Zuniga-Daly (R3)
+* Katelyn Baker (R3)
+* Kyriakos Tharrouniatis (R3)
+* Lorcan Wogan (R3)
+* Miljenko Brkic (R3)
+* Nikolett Nagy (R3)
+* Owen Stanford (R3)
+* Paul Hatcher (R3)
+* Ramzi El-Yafi (R3)
+* Razvan Codreanu (R3)
+* Ronan Browne (R3)
+* Ryan Fowler (R3)
+* Viktor Kolomeyko (R3)
+* Waldemar Zurowski (R3)
+* Walter Oggioni (R3)
+* William Vigor (R3)
+* Yash Nabar (R3)
+* Yiftach Kaplan (R3)