Add past contributors from before open source

* List of past contributors of Comdb2 before open source

* Fix Markdown

* Update INTERNAL_CONTRIBUTORS.md

* Update INTERNAL_CONTRIBUTORS.md

INTERNAL_CONTRIBUTORS.md

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+The following are contributors to Comdb2 predating the project's move to GitHub.
+
+## Core team
+ * Adi Zaimi
+ * Akshat Sikarwar
+ * Dorin Hogea
+ * James M Leddy
+ * Lingzhi Deng
+ * Mark Hannum
+ * Michael Ponomarenko
+ * Mohit Khullar
+ * Nirbhay Choubey
+ * Rivers Zhang
+
+## Past core team members
+ * Alex Scotti
+ * Chris Pick
+ * Fabio Angius
+ * Kirill Komarov
+ * Paul Lampert
+ * Sam Jervis
+
+## Contributors
+ * Alexander Evdokimov
+ * Andrew O'Brien
+ * Chris Holloway
+ * Chris Morgan
+ * Daniel Ruoso
+ * Dennis Gove
+ * Guillame Breuil
+ * Jan Horabik
+ * Johann Nystrom
+ * Junmin Liu
+ * Justin Erenkrantz
+ * Matt Hunt
+ * Michael Thorpe
+ * Rangan Prabhakaran
+ * Sean Winard
+ * Sebastien Blind
+ * Tzvetan Mikov
+
+Our sincerest apologies if we left anyone out - please contact us at <[email protected]>, and we'll be glad to add your name to the list.