docs(pr): add pull request template

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- This isn't strictly enforced but we would appreciate the following -->
+<!-- This is based on the template from [code2prompt](https://code2prompt.dev/) -->
+<!-- You can use c2p to generate this using an LLM or pass your git show output to any LLM with this template to generate a PR description -->
+
+### TLDR
+
+<!-- A quick, less than 80 chars description of the changes -->
+
+## Change Summary
+
+<!-- Provide list of key changes with good structure -->
+<!-- Mention the class name, function name, and file name -->
+<!-- Explain the code changes -->
+
+<!-- For example: -->
+
+## Change Summary
+
+#### Added Features:
+
+    1. **New Functions in `file_name`**:
+        - `function_name`: code description.
+
+#### Code Changes:
+
+    1. **In `file_name`**:
+
+#### Documentation Updates:
+
+    1. **In `file_name`**:
+
+### Demo
+
+<!-- Add screenshots, GIFs, or links to demonstrate the changes if needed -->
+
+### Context
+
+<!-- Add any additional context about the PR here -->