add method to merge contacts

src/pojo/contact_pojo.py

@@ -18,7 +18,7 @@ class ContactPojo:
     def __repr__(self):
         return "phone:{}, passport:{}, last_name:{}, first_name:{}, mail:{}, store:{}, ip_country:{},isp:{}".format(
             self.phone, self.passport, self.last_name, self.first_name, self.mail, self.store, self.ip_country,
-             self.isp)
+            self.isp)
 
     def __init__(self, phone_number: str, passport_number: str, last_name: str, first_name: str, mail: str, store: str,
                  ip_country="FR"):
@@ -29,6 +29,10 @@ class ContactPojo:
         self.mail = mail
         self.store = store
         self.ip_country = ip_country
+        self.ip_address = ""
+
+    def __hash__(self):
+        return hash(self.mail)
 
     def to_firestore_dict(self):
         dest = {