Add issue and pull request templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Report a bug to help us improve!
+title: ''
+labels: bug, needs labels
+assignees: ''
+---
+
+## bevy_dev_console version
+
+The release number or commit hash of the version you're using.
+
+## \[Optional\] Relevant system information
+
+If you cannot get `bevy_dev_console` to build or run on your machine, please include:
+
+- the Rust version you're using (you can get this by running `cargo --version`)
+  - Bevy (and by extension `bevy_dev_console`) relies on the "latest stable release" of Rust
+  - nightly should generally work, but there are sometimes regressions: please let us know!
+- the operating system or browser used, including its version
+  - e.g. Windows 10, Ubuntu 18.04, iOS 14
+
+## What you did
+
+Describe how you arrived at the problem. If you can, consider providing a code snippet or link.
+
+## What went wrong
+
+If it's not clear, break this out into:
+
+- what were you expecting?
+- what actually happened?
+
+## Additional information
+
+Other information that can be used to further reproduce or isolate the problem.
+This commonly includes:
+
+- screenshots
+- logs
+- theories about what might be going wrong
+- workarounds that you used
+- links to related bugs, PRs or discussions

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: Propose a new feature!
+title: ''
+labels: enchancements, needs labels
+assignees: ''
+---
+
+## What problem does this solve or what need does it fill?
+
+A description of why this particular feature should be added.
+
+## What solution would you like?
+
+The solution you propose for the problem presented.
+
+## What alternative(s) have you considered?
+
+Other solutions to solve and/or work around the problem presented.
+
+## Additional context
+
+Any other information you would like to add such as related previous work,
+screenshots, benchmarks, etc.

.github/pull_request_template.md

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+# Objective
+
+- Describe the objective or issue this PR addresses.
+- If you're fixing a specific issue, say "Fixes #X".
+
+## Solution
+
+- Describe the solution used to achieve the objective above.
+
+---
+
+## Changelog
+
+> This section is optional. If this was a trivial fix, or has no externally-visible impact, you can delete this section.
+
+- What changed as a result of this PR?
+- If applicable, organize changes under "Added", "Changed", or "Fixed" sub-headings
+- Stick to one or two sentences. If more detail is needed for a particular change, consider adding it to the "Solution" section
+  - If you can't summarize the work, your change may be unreasonably large / unrelated. Consider splitting your PR to make it easier to review and merge!