lib: add issue templates for bugs, features, and releases

Author: rustaceanrob

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: 'bug'
+assignees: ''
+
+---
+
+**Describe the bug**  
+<!-- A clear and concise description of what the bug is. -->
+
+**To Reproduce**  
+<!-- Steps or code to reproduce the behavior. -->
+
+**Expected behavior**  
+<!-- A clear and concise description of what you expected to happen. -->
+
+**Build environment**  
+ - Tag/commit: <!-- e.g. v0.13.0, 3a07614 --> 
+ - OS+version: <!-- e.g. ubuntu 20.04.01, macOS 12.0.1, windows -->  
+ - Rust/Cargo version: <!-- e.g. 1.56.0 --> 
+ - Rust/Cargo target: <!-- e.g. x86_64-apple-darwin, x86_64-unknown-linux-gnu, etc. -->  
+
+**Additional context**  
+<!-- Add any other context about the problem here. --> 

.github/ISSUE_TEMPLATE/enhancement_request.md

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+---
+name: Enhancement request
+about: Request a new feature or change to an existing feature
+title: ''
+labels: 'enhancement'
+assignees: ''
+
+---
+
+**Describe the enhancement**  
+<!-- A clear and concise description of what you would like added or changed. -->
+
+**Use case**  
+<!-- Tell us how you or others will use this new feature or change to an existing feature. --> 
+
+**Additional context**
+<!-- Add any other context about the enhancement here. --> 

.github/ISSUE_TEMPLATE/release.md

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+---
+name: Release
+about: Create a new release [for release managers only]
+title: 'Release MAJOR.MINOR.PATCH'
+labels: 'release'
+assignee
+---
+
+**Steps** 
+
+- [ ] Update the Kyoto version contained in the User Agent of the P2P Version message.
+- [ ] Update the changelog with the recent commit history.
+- [ ] Check the documentation for errors using `cargo +nightly doc --open`
+- [ ] Increase the version number in `Cargo.toml` according to semver
+- [ ] Attempt a publish dry-run using `cargo publish --dry-run`
+- [ ] Create a pull request and ensure all tests pass
+- [ ] Merge the pull request and publish from `master`
+