feat: implemented most of the backend api for administrator

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

@@ -20,7 +20,7 @@ public class User {
     private String userName;
 
     @Column(length = 255)
-    private String mainMail;
+    private String primaryMail;
 
     @Column(length = 255)
     private String secondaryMail;
@@ -34,13 +34,13 @@ public class User {
             Long idUser,
             String userSurname,
             String userName,
-            String mainMail,
+            String primaryMail,
             String secondaryMail,
             String phoneNumber) {
         this.idUser = idUser;
         this.userSurname = userSurname;
         this.userName = userName;
-        this.mainMail = mainMail;
+        this.primaryMail = primaryMail;
         this.secondaryMail = secondaryMail;
         this.phoneNumber = phoneNumber;
     }
@@ -69,12 +69,12 @@ public class User {
         userName = userName;
     }
 
-    public String getMainMail() {
-        return mainMail;
+    public String getPrimaryMail() {
+        return primaryMail;
     }
 
-    public void setMainMail(String mainMail) {
-        this.mainMail = mainMail;
+    public void setPrimaryMail(String mainMail) {
+        this.primaryMail = mainMail;
     }
 
     public String getSecondaryMail() {