chore: add GitHub issue and PR templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report 🐛
+description: Report a bug to help us improve
+labels: ['bug']
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+  - type: checkboxes
+    id: new-bug
+    attributes:
+      label: Is there an existing issue 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
+          required: true
+  - type: textarea
+    id: 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: steps-to-reproduce
+    attributes:
+      label: Steps to reproduce
+      description: Steps to reproduce the behavior.
+      placeholder: |
+        Please tell us how to reproduce this bug, for example:
+        1. Install dependencies with 'uv pip install -r requirements.txt'
+        2. Run the script with 'python main.py ...'
+        3. Use the following configuration options, if any
+        4. Observe the error
+    validations:
+      required: true
+  - type: textarea
+    id: expected-behavior
+    attributes:
+      label: Expected behavior
+      description: What should be the expected behavior.
+      placeholder: A clear and concise description of what you expected to happen.
+    validations:
+      required: true
+  - type: textarea
+    id: screenshots
+    attributes:
+      label: Screenshots / Logs
+      description: If applicable, add screenshots to help explain your problem.
+      placeholder: Paste your screenshots here.
+  - type: textarea
+    id: software-info
+    attributes:
+      label: Software information
+      description: |
+        Please provide the following information about your environment.
+        Run `deepfabric --version` to get the DeepFabric version.
+      value: |
+        - Operating system:
+        - Python version:
+        - DeepFabric version:
+    validations:
+      required: true
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional context
+      description: Do you want to share any additional context about this bug?
+      placeholder: Add any other context about the problem 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: markdown
+    attributes:
+      value: |
+        Thank you for suggesting this feature!
+  - type: checkboxes
+    id: new-feature
+    attributes:
+      label: Is there an existing issue or pull request for this?
+      description: Please search to see if an issue or pull request already exists for the feature you desire.
+      options:
+        - label: I have searched the existing issues and pull requests
+          required: true
+  - type: textarea
+    id: feature-description
+    attributes:
+      label: Feature description
+      description: Is your feature request related to a problem? Please describe.
+      placeholder: A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+    validations:
+      required: true
+  - type: textarea
+    id: desired-solution
+    attributes:
+      label: Desired solution
+      description: Describe the solution you'd like.
+      placeholder: A clear and concise description of what you want to happen.
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives-considered
+    attributes:
+      label: Alternatives considered
+      description: Describe alternatives you've considered.
+      placeholder: A clear and concise description of any alternative solutions or features you've considered.
+    validations:
+      required: true
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional context
+      description: Do you want to share any additional context about this feature?
+      placeholder: Add any other context about the feature here.

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+
+<!--- Describe your changes in detail -->
+
+## Motivation and Context
+
+<!--- Why is this change required? What problem does it solve? -->
+<!--- If it fixes an open issue, please link to the issue here. -->
+<!--- You can use keywords like "Closes #123" or "Fixes #123" to automatically close the issue on merge. -->
+
+## How Has This Been Tested?
+
+<!--- Please describe in detail how you tested your changes. -->
+<!--- Include details of your testing environment, and the tests you ran to -->
+<!--- see how your change affects other areas of the code, etc. -->
+
+## Screenshots / Logs (if applicable)
+
+## Types of Changes
+
+<!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
+
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to change)
+- [ ] Documentation (no code change)
+- [ ] Refactor (code restructuring with no functional changes)
+- [ ] Other (please describe)
+
+## Checklist:
+
+<!--- Go over all the following points, and put an `x` in all the boxes that apply. -->
+<!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
+
+- [ ] My code follows the code style of this project.
+- [ ] I have updated the documentation accordingly.
+- [ ] I have formatted the code with [ruff](https://github.com/astral-sh/ruff) (`uv run ruff format deepfabric/ tests/`).
+- [ ] I checked the lints with [ruff](https://github.com/astral-sh/ruff) (`uv run ruff check . --exclude notebooks/`).
+- [ ] I have added tests to cover my changes.
+- [ ] All new and existing tests passed.
+
+<!--- Thank you for contributing to deepfabric! ⛰️  -->