Create data saving format & Start saving data

[Amirka-Kh]

1. Define important relations.
2. Define file storage (file format [csv, xml], entry fields).

Consider several search scenarios to define best data arrangement in a file storage (search by commit, developer, project, file). Recommendation: use one entry per commit (considering file search commit should be defined as not unique)

[Timmmich19]

Conducted for now research