setup: prepare for pypi upload
related to swh-environment#1242 (closed)
add build/ to the gitignore file
docs: add a basic README file
Test Plan
check https://test.pypi.org/project/swh.model/
Migrated from D479 (view on Phabricator)
related to swh-environment#1242 (closed)
add build/ to the gitignore file
docs: add a basic README file
check https://test.pypi.org/project/swh.model/
Migrated from D479 (view on Phabricator)