Created login functinality

scripts/create_tables.sql

@@ -1,10 +1,11 @@
 CREATE TABLE IF NOT EXISTS Users (
     id INTEGER PRIMARY KEY,
+    username TEXT NOT NULL UNIQUE,
+    password TEXT NOT NULL,
     first_name TEXT NOT NULL,
     last_name TEXT NOT NULL,
     email TEXT NOT NULL UNIQUE,
-    phone TEXT NOT NULL UNIQUE,
-    password TEXT NOT NULL,
+    phone TEXT NOT NULL,
     role TEXT NOT NULL
 );