document cloning & usage of git-flow
document cloning & usage of git-flow

for developers with push access

Part of issue #4
geometalab/osmaxx-frontend,geometalab/osmaxx-frontend,geometalab/osmaxx-frontend,geometalab/osmaxx-frontend,geometalab/osmaxx,geometalab/osmaxx,geometalab/drf-utm-zone-info,geometalab/osmaxx,geometalab/drf-utm-zone-info,geometalab/osmaxx