Create CONTRIBUTING

contributing guide

.github/CONTRIBUTING

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+# Contributing to TT-Damage-Calculator
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+The preferred way to contribute to the Toontown Damage Calculator is through reporting bugs and requesting features on the [issue tracker](https://github.com/Vhou-Atroph/TT-Damage-Calculator/issues)!
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+To submit an issue, click on the "New issue" button and select whether your issue is a bug report, or a feature request. It is highly recommended to follow the template provided to ensure clear communication! If your issue is a bug report, a screenshot can be very helpful for identifying what problem you are experiencing.
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+In the submission of multiple bugs, please make an issue for each one! This will help make sure it's easy to track when each individual bug has been fixed.
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+When submitting your issue, please keep swearing and other profane language to a minimum. Running into problems can be frustrating, but the issue tracker isn't the place for venting these frustrations- it's for identifying bugs, or thinking of potential enhancements for the program!