Create CONTRIBUTING.md

CONTRIBUTING.md

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+## Filing a bug report
+
+I accept bug reports for the Creative Cloud script, but please note that **I can't do anything about most bugs**. The Wine compatibility layer is used to run the Creative Cloud installer and all downloaded Adobe programs. If you have issues with getting certain programs to run, you should [file a bug report with Wine](https://bugs.winehq.org/).
+
+When filing a Wine bug, please include the following information in your report to help the developers:
+
+* You are using 32-bit Wine 2.20-staging
+* You have the `msxml3`, `atmlib`, and `corefonts` winetricks installed
+
+## Filing a pull request
+
+Pull requests for the install script are welcome!