Create data_update_request_template.md

.github/data_update_request_template.md

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+## Data Update
+
+### Summary
+<!-- Describe what this data update includes. For example: "Adding new Valentines 2024 characters" -->
+
+#### New Additions
+<!-- List new items being added, grouped by type -->
+- Characters:
+  - [ ] 
+- Weapons:
+  - [ ] 
+- Summons:
+  - [ ] 
+
+#### Modifications
+<!-- List existing items being modified -->
+- Characters:
+  - [ ] 
+- Weapons:
+  - [ ] 
+- Summons:
+  - [ ] 
+
+### CSV Files Added
+<!-- List all CSV files included in this update -->
+- [ ] `YYYYMMDD-characters-XXX.csv`
+- [ ] `YYYYMMDD-weapons-XXX.csv`
+- [ ] `YYYYMMDD-summons-XXX.csv`
+
+### Checklist
+<!-- Make sure all these items are completed -->
+- [ ] CSV files use the correct naming format (`YYYYMMDD-{type}-XXX.csv`)
+- [ ] CSV files are in the correct location (`db/seed/updates/`)
+- [ ] All required fields are filled out
+- [ ] Dates use the correct format (`YYYY-MM-DD`)
+- [ ] Boolean values are either `true` or `false`
+- [ ] Arrays use the correct format (e.g., `{value1,value2}`)
+- [ ] Ran import in test mode (`bin/rails granblue:import_data TEST=true`)
+
+### Test Results
+<!-- Paste the output from running the import in test mode -->