Add pull request template

Author: smt5541

.github/pull_request_template.md

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+### 🛠 Changes being made
+
+#### Give examples of the changes you've made in this pull request. Include an itemized list if you can.
+
+### 🧠 Rationale behind the change
+
+#### Why did you choose to make these changes?
+
+#### Does this pull request resolve any open issues?
+
+#### Were there any trade-offs you had to consider?
+
+### 🧪 Testing
+
+- [ ] Have tests been added or updated for the changes introduced in this pull request?
+
+- [ ] Are the changes backwards compatible?
+
+#### If the changes aren't backwards compatible, what other options were explored?
+
+### ✨ Quality check
+
+- [ ] Are your changes free of any erroneous print statements, debuggers or other leftover code?
+
+- [ ] Has the README been updated to reflect the changes introduced (if applicable)?
+
+### 💬 Additional comments
+
+#### Feel free to add any further information below