DOC: Add GitHub issue templates

Author: Kai-Striega

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: Bug report
+description: Report a bug. For security vulnerabilities see Report a security vulnerability in the templates.
+title: "BUG: <Please write a comprehensive title after the 'BUG: ' prefix>"
+labels: [00 - Bug]
+
+body:
+- type: markdown
+  attributes:
+    value: >
+      Thank you for taking the time to file a bug report. Before creating a new
+      issue, please make sure to take a few minutes to check the issue tracker
+      for existing issues about the bug.
+
+- type: textarea
+  attributes:
+    label: "Describe the issue:"
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: "Reproduce the code example:"
+    description: >
+      A short code example that reproduces the problem/missing feature. It
+      should be self-contained, i.e., can be copy-pasted into the Python
+      interpreter or run as-is via `python myproblem.py`.
+    placeholder: |
+      import numpy_financial as npf
+      << your code here >>
+    render: python
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: "Error message:"
+    description: >
+      Please include full error message, if any.
+      If you are reporting a segfault please include a GDB traceback,
+      which you can generate by following
+      [these instructions](https://github.com/numpy/numpy/blob/main/doc/source/dev/development_environment.rst#debugging).
+    placeholder: |
+      << Full traceback starting from `Traceback: ...` >>
+    render: shell
+
+- type: textarea
+  attributes:
+    label: "Runtime information:"
+    description: >
+      Output from `import sys, numpy; print(numpy.__version__); print(sys.version)`
+      If you are running NumPy 1.24+, also show `print(numpy.show_runtime())`
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: "Context for the issue:"
+    description: |
+      Please explain how this issue affects your work or why it should be prioritized.
+    placeholder: |
+      << your explanation here >>
+  validations:
+    required: false

.github/ISSUE_TEMPLATE/config.yml

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+contact_links:
+  - name: Question/Help/Support
+    url: https://numpy.org/gethelp/
+    about: "If you have a question, please look at the listed resources available on the website."
+  - name: Development-related matters
+    url: https://numpy.org/community/
+    about: "If you would like to discuss development-related matters or need help from the NumPy team, see our community's communication channels."

.github/ISSUE_TEMPLATE/documentation.yml

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+name: Documentation
+description: Report an issue related to the NumPy-Financial documentation.
+title: "DOC: <Please write a comprehensive title after the 'DOC: ' prefix>"
+labels: [04 - Documentation]
+
+body:
+- type: textarea
+  attributes:
+    label: "Issue with current documentation:"
+    description: >
+      Please make sure to leave a reference to the document/code you're
+      referring to. You can also check the development version of the
+      documentation and see if this issue has already been addressed at
+      https://numpy.org/devdocs.
+
+- type: textarea
+  attributes:
+    label: "Idea or request for content:"
+    description: >
+      Please describe as clearly as possible what topics you think are missing
+      from the current documentation. Make sure to check
+      https://github.com/numpy/numpy-tutorials and see if this issue might be
+      more appropriate there.

.github/ISSUE_TEMPLATE/feature-request.yml

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+name: Feature request
+description: Check instructions for submitting your idea on the mailing list first.
+title: "ENH: <Please write a comprehensive title after the 'ENH: ' prefix>"
+
+body:
+- type: markdown
+  attributes:
+    value: >
+      If you're looking to request a new feature or change in functionality,
+      including adding or changing the meaning of arguments to an existing
+      function, please post your idea on the
+      [numpy-discussion mailing list](https://mail.python.org/mailman/listinfo/numpy-discussion)
+      to explain your reasoning in addition to opening an issue or pull request.
+      You can also check out our
+      [Contributor Guide](https://github.com/numpy/numpy/blob/main/doc/source/dev/index.rst)
+      if you need more information.
+
+- type: textarea
+  attributes:
+    label: "Proposed new feature or change:"
+  validations:
+    required: true