Adding GitHub Issue and PR templates (#323)

Adding GitHub Issue and PR templates

.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 checked the documentation for this library in the README.
+- [ ] I have checked the [Auth0 Community](https://community.auth0.com/) for related posts.
+- [ ] I have checked for related or duplicate [Issues](https://github.com/auth0/java-jwt/issues) and [PRs](https://github.com/auth0/java-jwt/pulls).
+- [ ] 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).
+- [ ] I am reporting this to the correct repository (note this library is used by many libraries, such as [auth0-java](https://github.com/auth0/auth0-java)).
+
+### Environment
+
+Please provide the following:
+
+- Version of this library used:
+- Version of Java framework used:
+- Additional libraries 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:
+
+- Code sample to reproduce the issue
+- 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)
+- Any alternative designs or approaches considered
+
+### References
+
+Please include relevant links supporting this change such as a:
+
+- support ticket
+- community post
+- StackOverflow post
+- support forum thread
+
+### 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 test coverage
+- [ ] This change has been tested on the latest version of Java or why not
+
+### 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