pr template (#48)

.github/pull_request_template.md

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+# [BOOK] `<title>`
+
+<!-- Example: [NLP] Add Transformers Pocket Reference -->
+<!-- Example: [CV] Fix CNN Architecture Diagram -->
+
+## Type of Change
+
+<!-- Put an `x` in the boxes that apply -->
+
+- [ ] New Pocket Reference
+- [ ] Edit to Existing Pocket Reference
+- [ ] Other (please describe):
+
+## Related Issue
+
+<!-- Link to the related issue -->
+
+Fixes #
+
+## Book
+
+<!-- Indicate which book this PR affects -->
+
+- [ ] fundamentals
+- [ ] nlp
+- [ ] cv
+- [ ] rl
+- [ ] fl
+- [ ] responsible_ai
+
+## Description
+
+<!-- Describe your changes in detail -->
+
+## Checklist
+
+<!-- Put an `x` in the boxes that apply -->
+
+- [ ] I have included appropriate contributor tags (`{{#author}}` or `{{#authors}}`)
+- [ ] I have added the reading time preprocessor tag under the title
+- [ ] Content is concise and within 7 minutes reading time
+- [ ] I have included relevant references and further reading links
+- [ ] I have tested locally using `mdbook watch books/<book-name> --open`
+- [ ] Pre-commit hooks pass without errors
+- [ ] I have linked to related issues
+
+## Additional Context
+
+<!-- Add any other context about the PR here -->