Add first info to landing page

src/allmende_payment_system/models.py

@@ -19,6 +19,10 @@ class Account(Base):
         back_populates="accounts",
     )
 
+    @property
+    def balance(self):
+        return 141.23
+
 
 user_account_association = Table(
     TABLE_PREFIX + "user_account_association",