chore: Update PR template (#925)

Author: madsroskar

PULL_REQUEST_TEMPLATE.md

@@ -1,9 +1,41 @@
-# Submit a pull request
+## 🎯 Goal
 
-## CLA
+_Describe why we are making this change_
 
-- [ ] I have signed the [Stream CLA](https://docs.google.com/forms/d/e/1FAIpQLScFKsKkAJI7mhCr7K9rEIOpqIDThrWxuvxnwUq2XkHyG154vQ/viewform) (required).
-- [ ] The code changes follow best practices
-- [ ] Code changes are tested (add some information if not applicable)
+## 🛠 Implementation details
+
+_Provide a description of the implementation_
+
+## 🎨 UI Changes
+
+_ Add relevant screenshots_
+
+<details>
+    <summary>iOS</summary>
+
+| Before | After |
+| --- | --- |
+| img | img |
+</details>
+
+
+<details>
+    <summary>Android</summary>
+
+| Before | After |
+| --- | --- |
+| img | img |
+</details>
+## 🧪 Testing
+
+_Explain how this change can be tested (or why it can't be tested)_
+
+## ☑️ Checklist
+
+- [ ] I have signed the [Stream CLA](https://docs.google.com/forms/d/e/1FAIpQLScFKsKkAJI7mhCr7K9rEIOpqIDThrWxuvxnwUq2XkHyG154vQ/viewform) (required)
+- [ ] PR targets the `develop` branch
+- [ ] Commits follow the [conventional commits](https://www.conventionalcommits.org/en/v1.0.0/) spec
+- [ ] New code is covered by tests
+- [ ] Screenshots added for visual changes
+- [ ] Documentation is updated
 
-## Description of the pull request