Added issue and pull request templates (#155)

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: Bug report
+description: File a bug report to help us improve
+labels: [Bug]
+
+body:      
+  - type: textarea
+    id: describe-bug
+    attributes:
+      label: Describe the bug
+      description: >
+        Please give us a clear and concise description of what the bug is.
+        Please include a screenshot if you are able to.
+    validations:
+      required: true
+
+  - type: textarea
+    id: example
+    attributes:
+      label: Example
+      description: >
+        Please provide a small and concise example to reproduce the issue.
+        This will be automatically formatted into code, so no need for
+        backticks.
+      render: python
+    validations:
+      required: true
+
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce
+      description: Please provide any further steps to reproduce the issue.
+      placeholder: |
+        1. ...
+        2. ...
+        3. ...
+
+  - type: textarea
+    id: expected-outcome
+    attributes:
+      label: Expected behaviour
+      description: Please tell us what the expected behaviour should be been.
+    validations:
+      required: true
+
+  - type: checkboxes
+    id: checked-latest
+    attributes:
+      label: Latest version
+      description: >
+        Please ensure that you have checked that this issue occurs on the
+        latest version of questionary. You can upgrade by running
+        `pip install -U questionary`.
+      options:
+        - label: >
+            I have checked that this issue occurs on the latest version of
+            questionary.
+          required: true
+
+  - type: input
+    id: questionary-version
+    attributes:
+      label: Questionary version
+      description: >
+        You can run `pip show questionary` to see the version of questionary
+        that is installed.
+    validations:
+      required: true
+
+  - type: input
+    id: prompt-toolkit-version
+    attributes:
+      label: Prompt Toolkit version
+      description: >
+        You can run `pip show prompt_toolkit` to see the version of Prompt
+        Toolkit that is installed.
+    validations:
+      required: true
+
+  - type: dropdown
+    id: operating-system
+    attributes:
+      label: Operating System
+      description: Which operating system are you using?
+      options:
+        - Windows
+        - macOS
+        - Linux
+        - Other (please specify in description)
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+
+contact_links:
+  - name: Documentation
+    url: https://questionary.readthedocs.io/
+    about: Please find answers to common questions here

.github/ISSUE_TEMPLATE/feature-request.yml

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+name: Feature request
+description: Suggest an idea for this project
+labels: [Enhancement]
+
+body:      
+  - type: textarea
+    id: problem-description
+    attributes:
+      label: Describe the problem
+      description: >
+        Is your feature request related to a problem? Please provide a clear
+        and concise description of what the problem is.
+      placeholder: I'm always frustrated when...
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution-description
+    attributes:
+      label: Describe the solution
+      description: >
+        Please provide a clear and concise description of the solution that you
+        would like to see.
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered
+      description: >
+        Please provide a clear and concise description of any alternative
+        solutions or features you have considered.

.github/ISSUE_TEMPLATE/question.yml

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+name: Need help
+description: Ask a question if you need help
+labels: [Question]
+
+body:      
+  - type: textarea
+    id: question
+    attributes:
+      label: Question
+      description: >
+        Please describe the problem that you are having.
+    validations:
+      required: true
+
+  - type: textarea
+    id: previous-attempts
+    attributes:
+      label: What have you already tried?
+      description: >
+        Please describe any attempts that you have made to solve the problem.
+        This might include code examples. This will help us get a better
+        understanding of what you are trying to do.
+    validations:
+      required: true
+
+  - type: checkboxes
+    id: read-the-docs
+    attributes:
+      label: Read the documentation
+      description: >
+        Please check if your question is answered by the
+        [documentation](https://questionary.readthedocs.io/). Don't worry if
+        you ask a question that is already answered by the documentation - we'll
+        just point you to the right place.
+      options:
+        - label: >
+            I have checked to ensure that my question is not answered by the
+            documentation.
+          required: true

.github/PULL_REQUEST_TEMPLATE.md

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+**What is the problem that this PR addresses?**
+<!-- Describe the rationale of your PR. -->
+<!-- Link all issues that it closes e.g. Closes #32 -->
+
+...
+
+**How did you solve it?**
+<!-- A detailed description of your implementation. -->
+
+...
+
+**Checklist**
+<!--- Put an `x` in all the boxes that apply. -->
+<!-- Automated tests validate that your PR follows our guidelines. -->
+<!-- If it doesn't pass, click on it to see details as to what your PR might be missing. -->
+
+- [ ] I have read the [Contributor's Guide](https://questionary.readthedocs.io/en/stable/pages/contributors.html#steps-for-submitting-code).
+- [ ] I will check that all automated PR checks pass before the PR gets reviewed.