docs: Add issue templates (#388)

.github/ISSUE_TEMPLATE/BUG_REPORT.yml

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+name: "\U0001F41E Bug Report"
+description: Create a report to help us improve the container
+title: "[Bug]: "
+labels: ["bug"]
+body:
+  - type: input
+    id: os
+    attributes:
+      label: OS version
+      description: The Linux distribution and kernel version as shown by `uname -a` 
+    validations:
+      required: true
+  - type: input
+    id: docker
+    attributes:
+      label: Docker version
+      description: The Docker version as shown by `docker -v` 
+    validations:
+      required: true
+  - type: textarea
+    id: summary
+    attributes:
+      label: Summary
+      description: A clear and concise description of what the problem is.
+    validations:
+      required: true
+  - type: textarea
+    id: compose
+    attributes:
+      label: Docker Compose file
+      description: The Docker Compose file (or otherwise `run` command) of the container
+    validations:
+      required: true
+  - type: textarea
+    id: log
+    attributes:
+      label: Docker log
+      description: The Docker logfile of the container
+    validations:
+      required: true
+  - type: textarea
+    id: screenshot
+    attributes:
+      label: Screenshots
+      description: Screenshot of the problem
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/FEATURE_REQUEST.yml

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+name: "\U0001F680 Feature request"
+description: Suggest an idea for improving the container
+labels: ["enhancement"]
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: Is your proposal related to a problem?
+      description: |
+        Provide a clear and concise description of what the problem is.
+        For example, "I'm always frustrated when..."
+    validations:
+      required: true
+  - type: textarea
+    id: solution
+    attributes:
+      label: Describe the solution you'd like.
+      description: |
+        Provide a clear and concise description of what you want to happen.
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Describe alternatives you've considered.
+      description: |
+        Let us know about other solutions you've tried or researched.
+    validations:
+      required: true
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+      description: |
+        Is there anything else you can add about the proposal?
+        You might want to link to related issues here, if you haven't already.

.github/ISSUE_TEMPLATE/QUESTION.yml

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+name: "? Question"
+description: General questions about the container
+title: "Question: "
+labels: ["question"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Have a question about Windows for Docker?
+        Please make sure to check the [FAQ](https://github.com/dockur/windows/blob/master/readme.md) first!
+  - type: textarea
+    id: question
+    attributes:
+      label: Question
+      description: What's the question you have about the container?
+    validations:
+      required: true