Add GitHub templates

.github/ISSUE_TEMPLATE.md

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+<!--
+Before submitting, please search open and closed issues at
+https://github.com/TheLocehiliosan/yadm/issues to avoid duplication.
+
+If you have found a security vulnerability, do NOT open an issue.
+Email yadm@yadm.io instead.
+-->

.github/ISSUE_TEMPLATE/BUG_REPORT.md

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+---
+name: Bug report
+about: Create a report to help improve yadm
+title: ''
+labels: bug
+assignees: ''
+
+---
+<!--
+Before submitting, please search open and closed issues at
+https://github.com/TheLocehiliosan/yadm/issues to avoid duplication.
+
+If you have found a security vulnerability, do NOT open an issue.
+Email yadm@yadm.io instead.
+-->
+
+### Describe the bug
+
+[A clear and concise description of what the bug is.]
+
+### To reproduce
+
+Can this be reproduced with the yadm/testbed docker image: [Yes/No]
+<!--
+Consider trying to reproduce the bug inside a docker container using the
+yadm/testbed docker image. https://hub.docker.com/r/yadm/testbed
+
+The easiest way to start this container, is to clone the TheLocehiliosan/yadm
+repo, and use the "scripthost" make target. For example:
+
+  $ git clone https://github.com/TheLocehiliosan/yadm.git
+  $ cd yadm
+  $ make scripthost version=1.11.0
+  Starting scripthost version="1.11.0" (recording script)
+  root@scripthost:~# ### run commands which
+  root@scripthost:~# ### demonstrate the problem
+  root@scripthost:~# ### a succinct set of commands is best
+  root@scripthost:~# exit
+  logout
+
+  Script saved to script.gz
+  $
+
+A script like this can be useful to developers to make a repeatable test for the
+problem. You can attach a script.gz file to an issue.
+https://help.github.com/en/articles/file-attachments-on-issues-and-pull-requests
+-->
+
+Steps to reproduce the behavior:
+
+1. Run command '....'
+2. Run command '....'
+3. Run command '....'
+4. See error
+
+### Expected behavior
+
+[A clear and concise description of what you expected to happen.]
+
+### Environment
+
+ - Operating system: [Ubuntu 18.04, yadm/testbed, etc.]
+ - Version yadm: [found via `yadm version`]
+ - Version Git: [found via `git --version`]
+
+### Additional context
+
+[Add any other context about the problem here.]

.github/ISSUE_TEMPLATE/FEATURE_REQUEST.md

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+---
+name: Feature request
+about: Suggest an idea for yadm
+title: ''
+labels: feature
+assignees: ''
+
+---
+<!--
+Before submitting, please search open and closed issues at
+https://github.com/TheLocehiliosan/yadm/issues to avoid duplication.
+-->
+
+### Is your feature request related to a problem? Please describe.
+
+[A clear and concise description of what the problem is. Ex. I'm always frustrated when ...]
+
+### Describe the solution you'd like
+
+[A clear and concise 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. For example, have you considered using yadm "hooks" as a solution?]
+
+### Additional context
+
+[Add any other context or screenshots about the feature request here.]

.github/ISSUE_TEMPLATE/OTHER.md

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+---
+name: Other issue
+about: Report issues with documentation, packaging, or something else
+title: ''
+labels: ''
+assignees: ''
+
+---
+<!--
+Before submitting, please search open and closed issues at
+https://github.com/TheLocehiliosan/yadm/issues to avoid duplication.
+-->
+
+### This issue is about
+
+* [ ] Man pages or command-line usage
+* [ ] Website documentation
+* [ ] Packaging
+* [ ] Other
+
+### Describe the issue
+
+[A clear and concise description of the issue.]

.github/ISSUE_TEMPLATE/SUPPORT.md

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+---
+name: Support
+about: Get help using yadm
+title: ''
+labels: 'question'
+assignees: ''
+
+---
+<!--
+Before submitting, please search open and closed issues at
+https://github.com/TheLocehiliosan/yadm/issues to avoid duplication.
+
+Please also consult:
+  * The FAQ: https://yadm.io/docs/faq
+  * The manual: https://github.com/TheLocehiliosan/yadm/blob/master/yadm.md
+-->
+
+### This question is about
+
+* [ ] Installation
+* [ ] Initializing / Cloning
+* [ ] Alternate files
+* [ ] Jinja templates
+* [ ] Encryption
+* [ ] Bootstrap
+* [ ] Hooks
+* [ ] Other
+
+### Describe your question
+
+<!--
+Consider including:
+  * the commands you've run, and the output produced
+  * links to any public repo/branch involved
+-->
+[A clear and concise description of the question.]

.github/PULL_REQUEST_TEMPLATE.md

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+### What does this PR do?
+
+[A clear and concise description of what this pull request accomplishes.]
+
+### What issues does this PR fix or reference?
+
+<!--
+Be sure to preface the issue/PR numbers with a "#".
+-->
+[A list of related issues / pull requests.]
+
+### Previous Behavior
+
+[Describe the existing behavior.]
+
+### New Behavior
+
+[Describe the behavior, after this PR is applied.]
+
+### Have [tests][1] been written for this change?
+
+[Yes / No]
+
+### Have these commits been [signed with GnuPG][2]?
+
+[Yes / No]
+
+---
+
+Please review [yadm's Contributing Guide][3] for best practices.
+
+[1]: https://github.com/TheLocehiliosan/yadm/blob/master/.github/CONTRIBUTING.md#test-conventions
+[2]: https://help.github.com/en/articles/signing-commits
+[3]: https://github.com/TheLocehiliosan/yadm/blob/master/.github/CONTRIBUTING.md