docs: add pull request template to standardize PR submissions

.github/pull_request_template.md

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+### 📌 What does this Pull Request do?
+<!-- Briefly describe the purpose of this change. Example: "Adds city filters to the dashboard reports." -->
+
+> ℹ️ Note: Remove or leave blank any section that does not apply.
+
+### ✅ Type of changes (check all that apply)
+- [ ] New feature
+- [ ] Bug fix
+- [ ] Code refactoring (reorganizing without changing behavior)
+- [ ] Documentation update
+- [ ] Other: _____
+
+### 🧾 Summary of changes
+<!-- Explain the most important changes, modified files/components, and the reason for the changes -->
+
+### 🧪 How to test this PR
+<!-- Describe the steps to test the changes. Example:
+1. Go to the dashboard.
+2. Select a city from the filter.
+3. Verify that the correct data is displayed.
+-->
+
+### 📎 Related issues
+<!-- Uncomment and edit if this PR is related to an issue -->
+<!-- Closes #123 -->
+<!-- You can also use: "Related to", "Fixes", etc. -->
+
+### ⚠️ Additional notes
+<!-- Extra information the reviewer should know. Example: "This change depends on the updated backend", "Export functionality not included yet", etc. -->