setup: prepare for pypi upload
- setup.py
- add a (minimalistic) README file
- add build/ and dist/ to gitignore
related to swh-environment#1242 (closed)
Test Plan
https://test.pypi.org/project/swh-journal
Migrated from D485 (view on Phabricator)
related to swh-environment#1242 (closed)
https://test.pypi.org/project/swh-journal
Migrated from D485 (view on Phabricator)