commit f75f6b56ad5aa6c45704d8f81e43bad1bfcd0fd8
Author: Adama Sow <adasow1@st.amu.edu.pl>
Date:   Mon Apr 27 23:32:50 2020 +0000

    Update page 'Backend'

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+We create a lot of many to one relation..
+just to avoid the generation of new classes..
+we didnt implement the controllers and repositories waiting to have the approval with the database structure:)
+In the classe TransCity(meaning the transport between city)we implemented all in one classe the specific things is the type of transport we could choose fly,bus etc....
+we will explain you tomorrow...
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