Add issue templates

.github/ISSUE_TEMPLATE/v1-bug-report.md

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+---
+name: v1 bug report
+about: Create a report to help us fix v1 bugs
+title: 'v1 bug: ( your bug title goes here )'
+labels: 'type: bug, status: triage, version: v1'
+assignees: lynncyrin
+
+---
+
+## Checklist
+
+* [ ] Are you running the latest v1 release? The list of releases is [here](https://github.com/urfave/cli/releases).
+* [ ] Did you check the manual for your release? The v1 manual is [here](https://github.com/urfave/cli/blob/master/docs/v1/manual.md)
+* [ ] Did you perform a search about this problem? Here's the [Github guide](https://help.github.com/en/github/managing-your-work-on-github/using-search-to-filter-issues-and-pull-requests) about searching.
+
+## Describe the bug
+
+A clear and concise description of what the bug is.
+
+## To reproduce
+
+Describe the steps or code required to reproduce the behavior
+
+## Expected behavior
+
+A clear and concise description of what you expected to happen.
+
+## Additional context
+
+Add any other context about the problem here.
+
+If the issue relates to a specific open source Github repo, please link that repo here.
+
+If you can reproduce this issue with a public CI system, please link a failing build here.
+
+## Want to fix this yourself?
+
+We'd love to have more contributors on this project! If the fix for this bug is easily explained and very small, free free to create a pull request for it. You'll want to base the PR off the `v1` branch, all `v1` bug fix releases will be made from that branch.
+
+## Run `go env` and paste its output here
+
+```
+# paste it in here
+```

.github/ISSUE_TEMPLATE/v2-bug-report.md

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+---
+name: v2 bug report
+about: Create a report to help us fix v2 bugs
+title: 'v2 bug: ( your bug title goes here )'
+labels: 'type: bug, version: v2, status: triage'
+assignees: ''
+
+---
+
+## Checklist
+
+* [ ] Are you running the latest v2 release? The list of releases is [here](https://github.com/urfave/cli/releases).
+* [ ] Did you check the manual for your release? The v2 manual is [here](https://github.com/urfave/cli/blob/master/docs/v2/manual.md)
+* [ ] Did you perform a search about this problem? Here's the [Github guide](https://help.github.com/en/github/managing-your-work-on-github/using-search-to-filter-issues-and-pull-requests) about searching.
+
+## Describe the bug
+
+A clear and concise description of what the bug is.
+
+## To reproduce
+
+Describe the steps or code required to reproduce the behavior
+
+## Expected behavior
+
+A clear and concise description of what you expected to happen.
+
+## Additional context
+
+Add any other context about the problem here.
+
+If the issue relates to a specific open source Github repo, please link that repo here.
+
+If you can reproduce this issue with a public CI system, please link a failing build here.
+
+## Want to fix this yourself?
+
+We'd love to have more contributors on this project! If the fix for this bug is easily explained and very small, free free to create a pull request for it.
+
+## Run `go env` and paste its output here
+
+```
+# paste it in here
+```

.github/ISSUE_TEMPLATE/v2-feature-request.md

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+---
+name: v2 feature request
+about: Suggest an improvement for v2
+title: 'v2 feature: ( your feature title goes here )'
+labels: 'type: feature, version: v2, status: triage'
+assignees: ''
+
+---
+
+## Checklist
+
+* [ ] Are you running the latest v2 release? The list of releases is [here](https://github.com/urfave/cli/releases).
+* [ ] Did you check the manual for your release? The v2 manual is [here](https://github.com/urfave/cli/blob/master/docs/v2/manual.md)
+* [ ] Did you perform a search about this feature? Here's the [Github guide](https://help.github.com/en/github/managing-your-work-on-github/using-search-to-filter-issues-and-pull-requests) about searching.
+
+## What problem does this solve?
+
+A clear and concise description of what problem this feature would solve. For example:
+
+- needing to type out the full flag name takes a long time, so I would like to suggest adding auto-complete
+- I use (osx, windows, linux) and would like support for (some existing feature) to be extended to my platform
+- the terminal output for a particular error case is confusing, and I think it could be improved
+
+## Solution description
+
+A detailed description of what you want to happen.
+
+## Describe alternatives you've considered
+
+A clear and concise description of any alternative solutions or features you've considered.