.github/: Add templates for Issues and PRs (#2611)

Author: elenaf9

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Create a bug report for rust-libp2p.
+---
+
+<!-- Thank you for filing a bug report! -->
+
+<!-- For security related issues please reach out to [email protected]. Please do not file a public issue on GitHub. -->
+
+## Summary
+
+<!--
+Please provide a short summary of the bug, along with any information you feel relevant to replicate the bug.
+-->
+
+## Expected behaviour
+
+<!-- Describe what you expect to happen.-->
+
+## Actual behaviour
+
+<!-- Describe what actually happens.-->
+
+<!--
+Include debug output in the code block by setting `RUST_LOG=debug` in your environment.
+-->
+<details><summary>Debug Output</summary>
+<p>
+
+```
+<output>
+```
+</p>
+</details>
+
+## Possible Solution
+<!--- Not obligatory, but suggest a fix/reason for the bug, or ideas how to implement the addition or change. -->
+
+## Version
+<!--
+Which version of libp2p are you using?
+-->
+
+- libp2p version (version number, commit, or branch):
+
+
+## Would you like to work on fixing this bug?
+
+<!--Any contribution towards fixing the bug is greatly appreciated.
+We are more than happy to provide help on the process.-->
+
+Yes / No / Maybe.

.github/ISSUE_TEMPLATE/config.yaml

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+blank_issues_enabled: true
+contact_links:
+  - name: Question
+    url:  https://github.com/libp2p/rust-libp2p/discussions/new?category=q-a
+    about: Please ask questions in the rust-libp2p GitHub Discussions forum.
+  - name: Libp2p Discourse Forum
+    url:  https://discuss.libp2p.io
+    about: Discussions and questions related to multiple libp2p implementations.

.github/ISSUE_TEMPLATE/enhancement.md

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+---
+name: Enhancement
+about: Suggest an improvement to an existing rust-libp2p feature.
+---
+
+## Description
+
+<!-- Describe the enhancement that you are proposing.-->
+
+## Motivation
+
+<!-- Explain why this enhancement is beneficial.-->
+
+## Current Implementation
+
+<!-- Describe the current implementation. -->
+
+## Are you planning to do it yourself in a pull request?
+
+<!--Any contribution is greatly appreciated. We are more than happy to provide help on the process.-->
+
+Yes / No / Maybe.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a new feature in rust-libp2p.
+---
+
+<!--
+Note: If you'd like to suggest an feature related to libp2p but not specifically related to the rust implementation, please file an issue at https://github.com/libp2p/specs instead.
+-->
+
+## Description
+
+<!-- Briefly describe the feature that you are requesting.-->
+
+## Motivation
+
+<!-- Explain why this feature is needed.-->
+
+## Requirements
+
+<!-- Write a list of what you want this feature to do.-->
+
+1.
+2.
+3.
+
+## Open questions
+
+<!-- Optional: use this section to ask any questions that are related to the feature.-->
+
+## Are you planning to do it yourself in a pull request?
+
+<!--Any contribution is greatly appreciated. We are more than happy to provide help on the process.-->
+
+Yes / No / Maybe.

.github/pull_request_template.md

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+# Description
+
+<!-- Please write a summary of your changes and why you made them.-->
+
+## Links to any relevant issues
+
+<!-- Reference any related issues.-->
+
+
+## Open Questions
+
+<!-- Unresolved questions, if any. -->
+
+## Change checklist
+
+<!-- Please add a Changelog entry in the appropriate crates and bump the crate versions if needed. See <https://github.com/libp2p/rust-libp2p/blob/master/docs/release.md#development-between-releases>-->
+
+- [ ] I have performed a self-review of my own code
+- [ ] I have made corresponding changes to the documentation
+- [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] A changelog entry has been made in the appropriate crates