Add Contact type

pyrogram/client/types/contact.py

@@ -0,0 +1,10 @@
+class Contact:
+    def __init__(self,
+                 phone_number: str,
+                 first_name: str,
+                 last_name: str = None,
+                 user_id: int = None):
+        self.phone_number = phone_number
+        self.first_name = first_name
+        self.last_name = last_name
+        self.user_id = user_id