Added GitHub templates.

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ""
+labels: "bug"
+---
+
+### Environment
+
+Include the result of the following commands:
+  - `nginx -V`
+  - `uname -a`
+
+### Description
+
+Describe the bug in full detail including expected and actual behavior.
+Specify conditions that caused it. Provide the relevant part of nginx
+configuration and debug log.
+
+- [ ] The bug is reproducible with the latest version of nginx
+- [ ] The nginx configuration is minimized to the smallest possible
+to reproduce the issue and doesn't contain third-party modules
+
+#### nginx configuration
+
+```
+# Your nginx configuration here
+```
+or share the configuration in [gist](https://gist.github.com/).
+
+#### nginx debug log
+
+It is advised to enable
+[debug logging](http://nginx.org/en/docs/debugging_log.html).
+```
+# Your nginx debug log here
+```
+or share the debug log in [gist](https://gist.github.com/).

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a feature for nginx
+title: ""
+labels: "feature"
+---
+
+### Describe the feature you'd like to add to nginx
+
+A clear and concise description of the feature.
+
+### Describe the problem this feature solves
+
+A clear and concise description of the problem.
+
+### Additional context
+
+Add any other context about the feature request here.

.github/pull_request_template.md

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+### Proposed changes
+
+Describe the use case and detail of the change.
+
+If this pull request addresses an issue on GitHub, make sure to reference that
+issue using one of the
+[supported keywords](https://docs.github.com/en/github/managing-your-work-on-github/linking-a-pull-request-to-an-issue).
+
+Before creating a pull request, make sure to comply with
+[`Contributing Guidelines`](/CONTRIBUTING.md).