issue and pull_request templates added

.github/ISSUE_TEMPLATE.md

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+## Issue Title
+
+### Description
+A clear and concise description of what the bug is or what enhancement you would like to see.
+
+### Steps to Reproduce (for bugs)
+1. Go to '...'
+2. Click on '...'
+3. Scroll down to '...'
+4. See error
+
+### Expected Behavior
+A clear and concise description of what you expected to happen.
+
+### Screenshots
+If applicable, add screenshots to help explain your problem.
+
+### Additional Context
+Add any other context about the problem here.
+

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+### Describe the bug
+A clear and concise description of what the bug is.
+
+### To Reproduce
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '...'
+3. Scroll down to '...'
+4. See error
+
+### Expected behavior
+A clear and concise description of what you expected to happen.
+
+### Screenshots
+If applicable, add screenshots to help explain your problem.
+
+### Additional context
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+### Is your feature request related to a problem? Please describe.
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+### Describe the solution you'd like
+A clear and concise description of what you want to happen.
+
+### Describe alternatives you've considered
+A clear and concise description of any alternative solutions or features you've considered.
+
+### Additional context
+Add any other context or screenshots about the feature request here.

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Thank you for your contribution! -->
+
+<!-- Please add a reviewer to the assignee section when you create a PR. If you don't have the access to it, we will shortly find a reviewer and assign them to your PR. -->
+
+## Why are these changes needed?
+
+<!-- Please give a short summary of the change and the problem this solves. -->
+
+## Related issue number
+
+<!-- For example: "Closes #1234" -->
+
+## Checks
+
+- [ ] I've included any doc changes needed for https://pypi.org/project/bpetokenizer/.
+- [ ] I've added tests (if relevant) corresponding to the changes introduced in this PR.
+- [ ] I've made sure all auto checks have passed.