[FEATURE] Update PR Templates

Author: jamesnulliu

.github/PULL_REQUEST_TEMPLATE/add_feature.md

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+<!--
+⚠️ YOUR PULL REQUEST TITLE SHOULD BE IN THE FOLLOWING FORMAT ⚠️:
+
+1. [FEATURE] ... (for adding a new feature)
+2. [FIX] ... (for fixing a bug)
+3. [TEST] ... (for adding tests)
+4. [REFACTOR] ... (for refactoring the code)
+5. [IMPROVE] ... (for any improvements not fitting in the above categories)
+5. [DOC] ...(for modifying the documentation)
+-->
+
+## 1. PR Description
+
+<!-- 
+A clear and concise description of what your pull request is.
+-->
+
+## 2. Related Issue and PR
+
+<!-- 
+If your PR is related to an issue or a pull request, please link it here. 
+
+If you are sure a related issue or PR can be closed after merging this pull 
+request, use the keyword `closes` in front of the issue or PR number. 
+
+For example:
+
+- closes #123
+- closes #124
+-->
+
+## 3. Test
+
+<!--
+If you modified the code, please provide the steps to test the feature.
+-->
+
+### 3.1. Environment
+
+<!--
+For example:
+
+| Software             | Version               |
+| -------------------- | --------------------- |
+| OS / Docker Image    | nvidia/cuda:latest    |
+| Compiler             | g++ 13.3.0; cuda 12.6 |
+| Other Softwares      |                       |
+-->
+
+| Software             | Version |
+| -------------------- | ------- |
+| OS / Docker Image    |         |
+| Compiler             |         |
+| Other Softwares      |         |
+
+### 3.2. Steps to Test
+
+<!-- Describe the steps to test the feature. -->
+
+### 3.3. Test Results
+
+<!-- Add the test results here. -->
+
+## 4. Additional Context
+
+<!-- Add any other context or screenshots about the feature request here. -->