This initial file commit fixes #7

Created by: mikezawitkowski

There is room for improvement but this should be enough to get someone started. Based on documentation from other CONTRIBUTING.md files, as well as other helpful resources encountered during Hacktoberfest, including:

• https://help.github.com/articles/setting-guidelines-for-repository-contributors/
• https://opensource.guide/starting-a-project/
• https://github.com/cliqz-oss/local-sheriff/blob/master/CONTRIBUTING.md
• https://github.com/rails/rails/blob/master/CONTRIBUTING.md