chore: port issue templates from go-ipfs

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: 'Bug Report'
+about: 'Report a bug in go-libp2p.'
+labels: bug
+---
+
+<!-- This is where you get to tell us what went wrong. When doing so, please make sure to include *all* relevant information.
+
+Please try to include:
+  * What you were doing when you experienced the bug.
+  * Any error messages you saw, *where* you saw them, and what you believe may have caused them (if you have any ideas).
+  * When possible, steps to reliably produce the bug.
+-->
+
+<details>
+<summary>Version Information</summary>
+<pre>
+<!-- Insert the output of `go list -m all` HERE -->
+</pre>
+</details>

.github/ISSUE_TEMPLATE/doc.md

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+---
+name: 'Documentation Issue'
+about: 'Report missing/erroneous documentation, propose new documentation, report broken links, etc.'
+labels: documentation
+---
+
+#### Location
+
+<!-- In the case of missing/erroneous documentation, where is the error? If possible, a link/url would be great! -->
+
+#### Description
+
+<!-- Describe the documentation issue. -->

.github/ISSUE_TEMPLATE/enhancement.md

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+---
+name: 'Enhancement'
+about: 'Suggest an improvement to an existing go-libp2p feature.'
+labels: enhancement
+---
+
+<!--
+Note: If you'd like to suggest an idea related to libp2p but not specifically related to the go implementation, please file an issue at https://github.com/libp2p/libp2p instead. Even better, create a new topic on the forums (https://discuss.libp2p.io).
+
+When requesting an _enhancement_, please be sure to include your motivation and try to be as specific as possible.
+-->

.github/ISSUE_TEMPLATE/feature.md

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+---
+name: 'Feature'
+about: 'Suggest a new feature in go-libp2p.'
+labels: feature
+---
+
+<!--
+Note: If you'd like to suggest an idea related to libp2p but not specifically related to the go implementation, please file an issue at https://github.com/libp2p/libp2p instead. Even better, create a new topic on the forums (https://discuss.libp2p.io).
+
+When requesting a _feature_, please be sure to include:
+  * Your motivation. Why do you need the feature?
+  * How the feature should work.
+
+Please try to be as specific and concrete as possible.
+-->

.github/ISSUE_TEMPLATE/question.md

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+---
+name: 'Question/Support'
+about: 'Ask a question about go-libp2p or request support.'
+labels: question, invalid
+---
+
+This bug tracker is only for actionable bug reports and feature requests. Please direct any questions to https://discuss.libp2p.io or to our Matrix (#libp2p:matrix.org) or IRC (#libp2p on freenode) channels.
+
+If you don't get an immediate response, please keep trying.