Create issue templates (#7336)

.github/ISSUE_TEMPLATE/i-have-a-question.md

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+---
+name: I have a question
+about: I have a question and don't see a clear answer in documentation
+title: How do I ...
+labels: ''
+assignees: ''
+
+---
+
+When asking a question please also include where you looked for an answer (so we can update the documentation if needed).

.github/ISSUE_TEMPLATE/other-type-of-bug-report.md

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+---
+name: Other type of bug report
+about: Let us know about an issues that does not fit into any of the other issues
+  types
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Environment**
+- OS: [e.g. Windows/Linux etc...]
+- Compiler: revision
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. ./vcpkg install xxxx
+2. See error
+Repro code when
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Failure logs** 
+-(please attached failure logs)
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/report-package-build-failure.md

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+---
+name: Report package build failure
+about: Let us know about build failures in ports.
+title: "[<port name>] build failure"
+labels: ''
+assignees: ''
+
+---
+
+**Host Environment**
+- OS: [e.g. Windows/Linux etc...]
+- Compiler: revision
+
+**To Reproduce**
+Steps to reproduce the behavior:
+`./vcpkg install xxxx`
+
+**Failure logs** 
+-Cut and past the appropriate build messages from the console output.
+-Please attach any additional failure logs mentioned in the console output.
+
+**Additional context**
+Add any other context about the problem here, such as what you have already tried to resolve the issue.

.github/ISSUE_TEMPLATE/request-a-feature-or-improvement-to-a-port.md

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+---
+name: Request a feature or improvement to a port
+about: Suggest an improvement to one the the ports/libraries in vcpkg
+title: "[<portname>] <short description of feature>"
+labels: ''
+assignees: ''
+
+---
+
+****
+
+**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 [...]
+
+**Proposed solution**
+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 if applicable.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/request-a-feature-or-improvement.md

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+---
+name: Request a feature or improvement
+about: Suggest an improvement to vcpkg
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+****
+
+**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 [...]
+
+**Proposed solution**
+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.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/request-a-new-port.md

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+---
+name: Request a new port
+about: Request a new port/library that vcpkg should support
+title: "[New Port Request] <library name here>"
+labels: ''
+assignees: ''
+
+---
+
+Library name:
+
+Library description:
+
+Source repository URL:
+
+Project homepage (if different from the source repository):
+
+Anything else that is useful to know when adding (such as optional features the library may have that should be included):

.github/ISSUE_TEMPLATE/request-an-update-to-an-existing-port.md

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+---
+name: Request an update to an existing port
+about: Let us know about a new version of a library we should pick up.
+title: "[<port name>] update to <version>"
+labels: ''
+assignees: ''
+
+---
+
+Library name:
+
+New version number:
+
+Other information that may be useful (release notes, etc...)