Add PR template.

.github/PULL_REQUEST_TEMPLATE.md

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+Before submitting your Pull Request, please ensure that you have carefully reviewed and completed all items on this checklist.
+
+1. **Content**
+    - [ ] The chapter content is complete and covers the topic in detail.
+    - [ ] All technical terms are well-defined and explained.
+    - [ ] Any code snippets or algorithms are well-documented and tested.
+    - [ ] The chapter follows a logical flow and structure.
+
+2. **References & Citations**
+    - [ ] All references are correctly listed at the end of the chapter.
+    - [ ] In-text citations are used appropriately and match the references.
+    - [ ] All figures, tables, and images have proper sources and are cited correctly.
+
+3. **Quarto Website Rendering**
+    - [ ] The chapter has been locally built and tested using Quarto.
+    - [ ] All images, figures, and tables render properly without any glitches.
+    - [ ] All images have a source or they are properly linked to external sites. 
+    - [ ] Any interactive elements or widgets work as intended.
+    - [ ] The chapter's formatting is consistent with the rest of the book.
+
+4. **Grammar & Style**
+    - [ ] The chapter has been proofread for grammar and spelling errors.
+    - [ ] The writing style is consistent with the rest of the book.
+    - [ ] Any jargon is clearly explained or avoided where possible.
+
+5. **Collaboration**
+    - [ ] All group members have reviewed and approved the chapter.
+    - [ ] Any feedback from previous reviews or discussions has been addressed.
+
+6. **Miscellaneous**
+    - [ ] All external links (if any) are working and lead to the intended destinations.
+    - [ ] If datasets or external resources are used, they are properly credited and linked.
+    - [ ] Any necessary permissions for reused content have been obtained.
+
+7. **Final Steps**
+    - [ ] The chapter is pushed to the correct branch on the repository.
+    - [ ] The Pull Request is made with a clear title and description.
+    - [ ] The Pull Request includes any necessary labels or tags.
+    - [ ] The Pull Request mentions any stakeholders or reviewers who should take a look.