Refactor and start implementing inline keyboards

commons.py

@@ -6,27 +6,12 @@ class Status(Enum):
 
 class Credential:
     def __init__(self, username: str, password: str):
-        self._username: str = username
-        self._password: str = password
-    
-    def __dict__(self):
-        return {
-            "username": self._username,
-            "password": self._password
-        }
-    
-    @property
-    def username(self) -> str:
-        return self._username
-    
-    @username.setter
-    def username(self, username: str):
-        self._username = username
-    
-    @property
-    def password(self) -> str:
-        return self._password
-    
-    @password.setter
-    def password(self, password: str):
-        self._password = password
+        self.username = username
+        self.password = password
+
+    def to_dict(self) -> dict:
+        return {"username": self.username, "password": self.password}
+
+    @classmethod
+    def from_dict(cls, data: dict):
+        return cls(data.get("username", ""), data.get("password", ""))