improve(tooling): add GitHub issue templates (#324)

.github/ISSUE_TEMPLATE/01-report-a-bug.yml

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+name: "🐛 Bug report"
+description: "Report a bug or a strange behavior."
+labels: ["triage"]
+title: "[BUG]: "
+assignees:
+  - Guts
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+
+  - type: checkboxes
+    id: cb_user_searched
+    attributes:
+      label: Is there an existing issue or a documentation page for this?
+      description: Please search to see if an issue already exists for the bug you encountered.
+      options:
+        - label: I have searched the existing issues and within documentation
+          required: true
+
+  - type: markdown
+    attributes:
+      value: |
+        ----
+
+        ## Environment
+
+  - type: input
+    id: in_qdt_version
+    attributes:
+      label: Which version of the app are you using?
+    validations:
+      required: true
+
+  - type: dropdown
+    id: dr_operating_system
+    attributes:
+      label: Operating System
+      description: |
+        On which operating systems did you met the bug?
+        Remember: those with a '*' are the officially supported.
+        If you pick `other`, please give more details in comment part at the end of form.
+      multiple: true
+      options:
+        - Linux Ubuntu*
+        - Windows 10+*
+        - MacOS 12
+        - Other
+    validations:
+      required: true
+
+  - type: dropdown
+    id: dr_packaging_mode
+    attributes:
+      label: Packaging mode
+      description: |
+        With which packaged mode did you encounter the bug.
+      multiple: true
+      options:
+        - CLI as stand-alone executable (.i.e DicoGIS-cli.exe or DicoGIS-cli.bin)
+        - GUI as stand-alone executable (.i.e DicoGIS-gui.exe or DicoGIS-gui.bin)
+        - Python package
+        - Source code
+    validations:
+      required: true
+
+  - type: textarea
+    id: tx_related_resources
+    attributes:
+      label: Related resources
+      description: |
+        Add details about your operating system, proxies, PostgreSQL version, upload datasets that you can share publicly here,
+        give URL to public resource with dataset directly...
+        Write everything you think it's necessary to describe your environment.
+
+  - type: markdown
+    attributes:
+      value: |
+        ----
+
+        ## Bug details
+
+  - type: textarea
+    id: tx_bug_description
+    attributes:
+      label: Description of the bug
+      description: Tell us what bug you encountered and what should have happened
+    validations:
+      required: true
+
+  - type: textarea
+    id: tx_reproduction_steps
+    attributes:
+      label: Steps to reproduce
+      description: Which steps do we need to take to reproduce this error?
+      placeholder: |
+        1. Open a terminal
+        1. Run DicoGIS in verbose mode (for example `DicoGIS-cli.exe --verbose`)
+        1. ...
+
+  - type: textarea
+    id: tx_logs
+    attributes:
+      label: Relevant log output
+      description: Run in verbose mode and provide log output. By default, logs files are stored in `~/.dicogis/logs` (~= `%USERHOME%\.dicogis\logs` in Windows)
+      render: Shell
+
+  - type: markdown
+    attributes:
+      value: |
+        ----
+
+        ## Miscellaneous
+
+  - type: textarea
+    id: tx_misc_comment
+    attributes:
+      label: Comment
+      description: Give details that you think they matter or just let a message to the team.

.github/ISSUE_TEMPLATE/02-feature-request.yml

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+name: "➕ Feature request"
+description: Want to submit an idea? Propose a change or feature request
+labels:
+  - enhancement
+  - triage
+title: "[Feature Request]: "
+assignees:
+  - Guts
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this feature request correctly.
+
+  - type: textarea
+    id: context
+    attributes:
+      label: Context
+      description: >-
+        This field is optional. You may provide additional context for the idea
+        you want to propose, helping us to understand what you are working on
+        and what you are trying to achieve. If the context is not relevant, you
+        can leave this field empty.
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: >-
+        Please provide a detailed description of your idea in 2-3 sentences so
+        that we maintainers can fully understand what change, feature, or the
+        improvement you are proposing. Don't yet explain the benefits of your
+        idea, we'll come to that. Focus on functionality.
+    validations:
+      required: true
+
+  - type: textarea
+    id: related-links
+    attributes:
+      label: Related links
+      description: >-
+        Please list all links to open and closed [issues](https://github.com/Guts/DicoGIS/issues),
+        [discussions](https://github.com/Guts/DicoGIS/discussions),
+        or to [documentation sections](https://guts.github.io/DicoGIS/)
+        that are relevant to your idea.
+        If you discussed your idea with the community on our
+        [discussion board](https://github.com/Guts/DicoGIS/discussions)
+        prior to creating this change request, please link the discussion here as well.
+    validations:
+      required: true
+
+  - type: textarea
+    id: use-cases
+    attributes:
+      label: Use Cases
+      description: >-
+        Please explain how your idea will work from an QGIS admin's and user's
+        perspective. Elaborate on how the change would positively impact not only
+        you but the community and how it aligns with the goals and [philosophy](https://guts.github.io/DicoGIS/#what-is-it)
+        of the project.
+    validations:
+      required: true
+
+  - type: textarea
+    id: visuals
+    attributes:
+      label: Visuals
+      description: >-
+        This field is optional. You may provide sketches, screenshots, mockups,
+        or external assets to illustrate your idea.
+      placeholder: |-
+        Drag and drop images here or link external assets.
+
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: Before submitting
+      description:
+        Please ensure your idea fulfills all of the following requirements. If
+        you need clarification on a specific requirement, follow the link to
+        learn about it and understand why it is necessary before ticking the box.
+        This will save the maintainers and you valuable time.
+      options:
+        - label: >-
+            I have verified that my idea is a change request and not a bug report.
+          required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Ask, answer, share
+    url: https://github.com/Guts/DicoGIS/discussions/
+    about: Have a question or need help? Have an answer or idea to share? Connect with the community on our discussion board
+  - name: Support DicoGIS development or want to use it in your organization?
+    url: https://guts.github.io/DicoGIS/misc/funding.html
+    about: Want to contract to use DicoGIS in your organization or to fund or sponsor a feature or a bug fix?