repo: add issue and pr templates (#84)

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: Bug Report
+description: Report a bug building or running Helium
+labels: ["bug"]
+title: "[Bug]: "
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Before submitting this bug report, please search existing issues and make sure it's unique.
+        If you ignore this text, and create this one, you will be permanently banned from
+        interacting with the entire organization.
+
+        If you suspect your bug might be specific to a certain platform (e.g. macOS),
+        please submit it to the relevant repository instead of the root "helium" repo.
+  - type: dropdown
+    id: os
+    attributes:
+      label: Operating system
+      description: The OS you are running Helium on
+      options:
+          - macOS
+          - Linux
+          - Windows
+    validations:
+        required: true
+  - type: input
+    id: version
+    attributes:
+      label: Version
+      description: Can be copied from helium://settings/help
+    validations:
+      required: true
+  - type: checkboxes
+    attributes:
+      label: Have you tested that this is not an upstream issue or an issue with your configuration?
+      options:
+        - label: I have tried reproducing this issue in Chrome and it could not be reproduced there
+        - label: I have tried reproducing this issue in ungoogled-chromium and it could not be reproduced there
+        - label: I have tried reproducing this issue in Helium with a new and empty profile using `--user-data-dir` command line argument and it could not be reproduced there
+  - type: input
+    id: description
+    attributes:
+      label: Description
+      description: A clear and concise description (in one line) of what the bug is.
+    validations:
+      required: true
+  - type: textarea
+    id: repro
+    attributes:
+      label: How to Reproduce?
+      description: Steps to reproduce the behavior
+      placeholder: |
+        1. Go to '...'
+        2. Click on '...'
+        3. Scroll down to '...'
+        4. See error
+    validations:
+      required: true
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual behavior
+      description: A clear and concise description of what actually happened
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected behavior
+      description: A clear and concise description of what you expected to happen
+    validations:
+      required: true
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional context
+      description: Add any other context about the problem here. If applicable, add screenshots to help explain your problem.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature-request.yml

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+name: Feature request
+description: Suggest an idea
+labels: ["feat", "pending"]
+title: "[FR]: "
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Before submitting this request, please search existing issues and make sure it's unique.
+        If you ignore this text, and create this one, you will be permanently banned from
+        interacting with the entire organization.
+
+        Please do not use AI for writing your request's description, no one wishes
+        to read that and thus your request will be closed.
+
+        If your request is for a platform-specific feature (e.g. for macOS), please
+        submit it to the relevant platform repo instead of the generic "helium" repo.
+  - type: input
+    id: description
+    attributes:
+      label: Description
+      description: A clear and concise description (in one line) of what your suggestion is
+    validations:
+      required: true
+  - type: checkboxes
+    attributes:
+      label: Who's implementing?
+      options:
+        - label: I'm willing to implement this feature myself
+  - type: textarea
+    id: prob
+    attributes:
+      label: The problem
+      description: Please describe the problem you are solving or new feature you're suggesting
+      placeholder: I'm always frustrated when [...] happens
+    validations:
+      required: true
+  - type: textarea
+    id: sol
+    attributes:
+      label: Possible solutions
+      description: Please describe possible solution(-s) to your problem
+    validations:
+      required: true
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional context
+      description: Add any other context about the feature request here

.github/ISSUE_TEMPLATE/misc.md

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+---
+name: Blank issue
+about: Create a new issue from scratch
+---
+
+For your issue to not get closed without review, please confirm that:
+
+- [ ] This issue does not fit into any of the predefined categories, which is
+      why I am making a blank issue from scratch.
+- [ ] I am not reporting a security vulnerability through this issue, because
+      I am aware that there is an appropriate channel for that.
+- [x] I understand that I will be permanently banned from interacting with this
+      organization if I lied by checking any of these checkboxes.
+
+---
+
+[your issue text goes here]

.github/PULL_REQUEST_TEMPLATE.md

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+For your pull request to not get closed without review, please confirm that:
+
+- [ ] An issue exists where the maintainers agreed that this should be implemented.
+      If such issue did not exist before, I opened one.
+- [ ] I tested that my contribution works locally, and does not break anything,
+      otherwise I have marked my PR as draft.
+- [ ] If my contribution is non-trivial, I did not use AI to write most of it.
+- [x] I understand that I will be permanently banned from interacting with this
+      organization if I lied by checking any of these checkboxes.
+
+Tested on (check one or more):
+- [ ] Windows
+- [ ] macOS
+- [ ] Linux
+
+---
+
+[short description of your PR goes here]