Add issue and PR templates

Author: joshcanhelp

.github/ISSUE_TEMPLATE.md

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+In order to efficiently and accurately address your issue or feature request, please read through the template below and answer all relevant questions. Your additional work here is greatly appreciated and will help us respond as quickly as possible. Please delete any sections or questions below that do not pertain to this request.
+
+For general support or usage questions, please use the [Auth0 Community](https://community.auth0.com/) or [Auth0 Support](https://support.auth0.com.).
+
+### Description
+
+Description of the bug or feature request and why it's a problem. Consider including:
+
+- The use case or overall problem you're trying to solve
+- Information about when the problem started
+
+### Prerequisites
+
+* [ ] I have read the [Auth0 general contribution guidelines](https://github.com/auth0/open-source-template/blob/master/GENERAL-CONTRIBUTING.md)
+* [ ] I have read the [Auth0 Code of Conduct](https://github.com/auth0/open-source-template/blob/master/CODE-OF-CONDUCT.md)
+* [ ] Did you check the documentation ([repo README](https://github.com/auth0/ruby-auth0/blob/master/README.md) or [Quickstart](https://auth0.com/docs/quickstart/backend/rails))?
+* [ ] Did you check the [Auth0 Community](https://community.auth0.com/)?
+* [ ] Are you reporting this to the correct repository? See also the [OmniAuth-Auth0 strategy](https://github.com/auth0/omniauth-auth0) for logging in with Rails.
+* [ ] Are there any related or duplicate [Issues](https://github.com/auth0/ruby-auth0/issues) or [PRs](https://github.com/auth0/ruby-auth0/pulls) for this issue?
+
+### Environment
+
+Please provide the following:
+
+* Ruby Auth0 version:
+* Ruby version:
+* Rails version (if applicable):
+* Browser version (if applicable):
+* Additional gems that might be affecting your instance
+
+### Reproduction
+
+Detail the steps taken to reproduce this error and note if this issue can be reproduced consistently or if it is intermittent.
+
+Please include:
+
+- Log files (redact/remove sensitive information)
+- Application settings (redact/remove sensitive information)
+- Screenshots, if helpful

.github/PULL_REQUEST_TEMPLATE.md

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+### Changes
+
+Please describe both what is changing and why this is important. Include:
+
+- Endpoints added, deleted, deprecated, or changed
+- Classes and methods added, deleted, deprecated, or changed
+- Screenshots of new or changed UI, if applicable
+- A summary of usage if this is a new feature or change to a public API (this should also be added to relevant documentation once released)
+
+### References
+
+Please include relevant links supporting this change such as a:
+
+- support ticket
+- community post
+- StackOverflow post
+- support forum thread
+
+Please note any links that are not publicly accessible.
+
+### Testing
+
+Please describe how this can be tested by reviewers. Be specific about anything not tested and reasons why. If this library has unit and/or integration testing, tests should be added for new functionality and existing tests should complete without errors.
+
+* [ ] This change adds unit test coverage
+* [ ] This change adds integration test coverage
+* [ ] This change has been tested on the latest version of Ruby
+
+### Checklist
+
+* [ ] I have read the [Auth0 general contribution guidelines](https://github.com/auth0/open-source-template/blob/master/GENERAL-CONTRIBUTING.md)
+* [ ] I have read the [Auth0 Code of Conduct](https://github.com/auth0/open-source-template/blob/master/CODE-OF-CONDUCT.md)
+* [ ] All existing and new tests complete without errors
+* [ ] Rubocop passes on all added/modified files
+* [ ] All active GitHub checks have passed

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+Please see [Auth0's code of conduct guidelines](https://github.com/auth0/open-source-template/blob/master/CODE-OF-CONDUCT.md) for information on contributing to this repo.