Create CONTRIBUTING.md

Author: DaveParr

CONTRIBUTING.md

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+## Thanks so much for your interest!
+
+First, thanks for volunteering your time, work and skill into this project. You're helping more people deliver better R conferences around the world.
+
+## Guidance
+
+Because this project is gathering more contributors and more features (which is brilliant), we need to also consistently make the repo ready for 'production'. Therefore, we use a simple method of contributing pull requests into the `develop` branch. From there they will be merged into the main production branch.