Add CONTRIBUTORS.md

CONTRIBUTORS.md

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+# DuckStation Contributors List
+The following people have contributed to the project in some way, and are credited here.
+
+## Code Contributions
+- Connor McLaughlin - @stenzek
+- @ggrtk
+
+## Game Compatibility Database
+ - @Zet-sensei
+ - @DarkFrost89
+
+## Special Thanks
+The following people did not directly contribute to the emulator, but it would not be in the state if not for them.
+ - nocash (https://problemkaputt.de/) for fantastic documentation.
+ - @PeterLemon for great simple test programs.
+ - amidog for CPU, GTE and GPU test programs.
+ - Jakub Czekański - @JaCzekanski - for collaboration on hardware tests.
+