Create developer_guide.rst for Sphinx documentation

Author: AlexanderMon

docs/developer_guide.rst

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+Developer Guide
+===============
+
+Architecture
+------------
+- Django project under `server/`
+- Main app: `drmaatic/` with `task/` and `job/` modules
+- Uses Django REST Framework and drmaa-python
+
+Development Setup
+-----------------
+1. Fork and clone repo
+2. Create a virtualenv and install:
+   pip install -r requirements.txt -r dev-requirements.txt
+3. Use docker/testing for SLURM
+4. Run migrations and createsuperuser
+5. Start development server
+
+Running Tests
+-------------
+Run with:
+   python manage.py test
+
+Contributing
+------------
+- Follow PEP8
+- Use Django/DRF best practices
+- Document new features
+- Submit PRs to `dev` branch
+
+Advanced Configuration
+----------------------
+- Settings via `.env`
+- Customize auth providers (e.g., ORCID)
+- Job execution uses DRMAA (or shell scripts)