👥 add the pull request template for pull request rules

PULL_REQUEST_TEMPLATE.md

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+## Title, example:
+
+Prepare the endpoints & CRUD operations for tasks table
+
+## Description, example: Prepare the endpoints & CRUD operations for tasks table
+
+Prepare the endpoints & CRUD operations for tasks table:
+
+- Prepare `schemas/task.py` that represents the schema of task's pydantic models and the enums.
+- Prepare `infrastructures/crud/task.py` that responsible for task's CRUD operations.
+- Prepare `routers/task.py` that responsible for task's routers/endpoints.
+- Prepare `main.py` that represents the entry point.
+- Update the schema of tasks table in `models/task.py`.
+- Update `Makefile`.
+- Update `ci.yml`.
+- Write unittest for `routers/task.py`.
+- Write unittest for `models/task.py`.
+- Write unittest for `schemas/task.py`.
+- Write unittest for `infrastructures/crud/task.py`.
+- Change the name, version of the project in `pyproject.toml`.
+- Update the document `README.md` version-3.
+
+## Related Issue, example:
+
+issue: #7 TTL-4
+
+## And don't forget in the sidebar:
+
+### Reviewers, example:
+
+@IsmaelMousa
+
+### Assignees, example:
+
+@IsmaelMousa
+
+### Labels, example:
+
+- database
+- documentation
+- enhancement
+
+### Development (if this pull-request is related to an issue), example:
+
+TTL-4