Add documentation for development

Author: eggplants

DEVELOPMENT.md

@@ -0,0 +1,51 @@
+# How to develop
+
+## Requirement
+
+- `python>=3.9`
+- `java`
+
+## Setup
+
+```bash
+pip install pipx
+pipx install poetry
+
+poetry install
+poetry run pre-commit install
+```
+
+## Activate virtual environment (venv) for development
+
+```bash
+poetry shell
+```
+
+## Lint
+
+```bash
+# in venv:
+task lint
+```
+
+## Fetch latest jar file and run tests
+
+```bash
+# in venv:
+DOWNLOAD_LATEST_ONLY=1 python publish.py
+task test
+```
+
+## Run tests for all unpublished versions without publishing
+
+```bash
+# in venv:
+DRYRUN=1 python publish.py
+```
+
+## Publish all unpublished versuibs to PyPI (for CI)
+
+```bash
+# in venv:
+python publish.py
+```