feat: added most of shared API calls

MyINPulse-back/src/main/java/enseirb/myinpulse/model/Entrepreneur.java

@@ -75,4 +75,8 @@ public class Entrepreneur extends User {
     public void setSneeStatus(boolean statusSnee) {
         this.sneeStatus = sneeStatus;
     }
+
+    public Project getProjectParticipation() {
+        return projectParticipation;
+    }
 }

MyINPulse-back/src/main/java/enseirb/myinpulse/model/Project.java

@@ -93,6 +93,10 @@ public class Project {
         this.projectStatus = projectStatus;
     }
 
+    public Administrator getAdministrator() {
+        return this.projectAdministrator;
+    }
+
     public void setAdministrator(Administrator administrator) {
         this.projectAdministrator = administrator;
     }