Add dcmcdoug to CONTRIBUTING.md

Author: dcmcdoug

CONTRIBUTING.md

@@ -61,4 +61,5 @@ Thanks so much to everyone [who has contributed](https://github.com/codefori/vsc
 * [@Detrytus59](https://github.com/Detrytus59)
 * [@janfh](https://github.com/janfh)
 * [@MohitKambli](https://github.com/MohitKambli)
-* [@bspotswood](https://github.com/bspotswood)
+* [@bspotswood](https://github.com/bspotswood)
+* [@dcmcdoug](https://github.com/dcmcdoug)