Add basic documentation

Add documentation for git flow (branch/commit names + sequence diagram) and a description in the readme

changed due date to October 15, 2020

added In Progress label

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added To Review label and removed In Progress label

created merge request !1 (closed) to address this issue

mentioned in merge request !1 (closed)

assigned to @s75767 and unassigned @s75706

assigned to @s75706 and unassigned @s75767

mentioned in commit 25498ac1

created merge request !2 (closed) to address this issue

mentioned in merge request !2 (closed)

closed

removed To Review label

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