Create DEVELOP.md

Author: guanzhi

DEVELOP.md

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+# GmSSL-Python Develop
+
+## Publish to PiPy
+
+See https://packaging.python.org/distributing/
+
+1. Update version in `gmssl.py`
+2. Update version in `pyproject.toml`
+3. Build package, run `python3 -m build`
+4. Publish package to PiPy, run `python3 -m twine upload dist/*`
+
+