improvement: Add ISSUE_TEMPLATES to guide users and contributors (for bugs and feature requests)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## Describe the bug
+
+A clear and concise description of what the bug is.
+
+Formatting tips: GitHub supports Markdown: https://guides.github.com/features/mastering-markdown/
+
+## To Reproduce
+
+Provide a link to a live example, or an unambiguous set of steps to reproduce this bug. Include configuration, logs, etc. to reproduce, if relevant.
+
+1.
+2.
+3.
+4.
+
+## Expected behavior
+
+A clear and concise description of what you expected to happen.
+
+## Possible Solution
+
+Not obligatory, but suggest a fix/reason for the bug, or ideas how to implement: the addition or change.
+
+## Your Environment
+
+Include as many relevant details about the environment you experienced the problem in
+
+* go-jira version (git tag or sha):
+* Go version (`go version`):
+* Jira version:
+* Jira type (cloud or on-premise):
+* Involved Jira plugins:
+* Operating System and version:
+
+## Additional context
+
+Add any other context about the problem here.
+
+How has this issue affected you? What are you trying to accomplish?
+Providing context helps us come up with a solution that is most useful in the real world.
+
+

.github/ISSUE_TEMPLATE/config.yml

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+contact_links:
+  - name: Report a bug/feature request for the Jira Command Line Client
+    url: https://github.com/go-jira/jira/issues
+    about: This is the issue tracker for the Jira command-line client in Go. If you are using this, please report issues there.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## Is your feature request related to a problem? Please describe.
+
+A clear and concise description of what the problem is. Ex. I'm always using this feature but am missing [...]
+
+## Describe the solution you'd like
+
+A clear and concise description of what you want to happen.
+
+## Describe alternatives you've considered
+
+A clear and concise description of any alternative solutions or features you've considered.
+
+## Additional context
+
+Add any other context or screenshots about the feature request here.