Create issue templates (#374)

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug Report
+about: Create a bug report to help us understand your issue
+title: 'Bug: <description>'
+labels: ":ant: bug"
+assignees: ''
+
+---
+
+**Bug Description**
+A clear and concise description of what the bug is. Please be more descriptive than "doesn't work".
+
+**What did you do?**
+Describe the steps to reproduce the behavior
+
+**What did you expect to happen?**
+
+**What actually happened?**
+
+**Environment**
+ - Mage Version: [run mage --version]
+ - OS: [e.g. windows/linux/mac]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/everything-else.md

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+---
+name: Everything Else
+about: An issue that isn't a bug or a feature
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+If you have a question about how to use mage or any kind of discussion rather than something that is literally a bug report or feature request, consider heading on over to Mage's [Discussion](https://github.com/magefile/mage/discussions) area of github. That's your best bet for finding answers and helping other people who have the same question you have.

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: Feature Request
+about: Suggest a new feature for Mage
+title: 'Enhancement: <description>'
+labels: ":sparkles: enhancement"
+assignees: ''
+
+---
+
+**Describe the feature**
+A clear and concise description of what the feature should do.  Focus more on behavior than specific names, flags, etc.
+
+**What problem does this feature address?**
+How does this benefit users of Mage?
+
+**Additional context**
+Add any other context or screenshots about the feature request here.