Add issues/PR templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve Tailwind CSS Playground
+---
+
+## Bug report
+
+### Summary
+
+Quick summary what's this issue about.
+
+### Step to reproduce
+
+How to reproduce the issue, including custom code if needed.
+
+### Observed behavior
+
+How it behaved after following steps above.
+
+### Expected behavior
+
+How it should behave after following steps above.
+
+### Environment
+
+Apache/NGINX and version, mysql version, browser, etc. Any relevant information.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea that makes Tailwind CSS Playground even better
+---
+
+## Feature request
+
+### Summary
+
+Quick summary what's this feature request about.
+
+### Why is it needed?
+
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+### Suggested solution(s)
+
+A clear and concise description of what you want to happen.
+
+### Related issue(s)/PR(s)
+
+Let us know if this is related to any issue/pull request.

.github/PULL_REQUEST_TEMPLATE.md

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+### What does it do?
+
+Describe the technical changes you did.
+
+### Why is it needed?
+
+Describe the issue you are solving.
+
+### Related issue(s)/PR(s)
+
+Let us know if this is related to any issue/pull request