add feature request, bug report, and question issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: You're experiencing an issue with Consul that is different than the documented behavior.
+
+---
+
+When filing a bug, please include the following headings if
+possible. Any example text in this template can be deleted.
+
+#### Overview of the Issue
+
+A paragraph or two about the issue you're experiencing.
+
+#### Reproduction Steps
+
+Steps to reproduce this issue, eg:
+
+1. Create a cluster with n client nodes n and n server nodes
+1. Run `curl ...`
+1. View error
+
+### Consul info for both Client and Server
+
+The `consul info` command provides information for us
+about the agents running both as clients and servers.
+
+Client:
+
+```
+[Client `consul info` here]
+```
+
+Server:
+
+```
+[Server `consul info` here]
+```
+
+### Operating system and Environment details
+
+OS, Architecture, and any other information you can provide
+about the environment.
+
+### Log Fragments
+
+Include appropriate Client or Server log fragments.
+If the log is longer than a few dozen lines, please
+include the URL to the [gist](https://gist.github.com/).
+
+Use `-log-level=TRACE` on the client and server to capture the maximum log detail.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: If you have something you think Consul could improve
+or add support for.
+
+---
+
+Please search the existing issues for relevant feature requests,
+and use the [reaction]() feature to add upvotes to pre-existing
+requests.
+
+#### Feature Description
+
+A written overview of the feature.
+
+#### Use Case(s)
+
+Any relevant use-cases that you see.

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: If you have a question, please check out our other community resources instead of opening an issue.
+
+---
+
+Issues on GitHub are intended to be related to bugs or feature requests, so we recommend using our other community resources instead of asking here.
+
+- [FAQ (Frequently asked questions)](https://www.consul.io/docs/faq.html)
+- [Consul Guides](https://www.consul.io/docs/guides/index.html)
+- Any other questions can be sent to the [consul mailing list](https://www.consul.io/community.html)