implemented basis of login, missing database connection.

database_setup.sql

@@ -0,0 +1,7 @@
+CREATE TABLE users (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    username VARCHAR(20) NOT NULL UNIQUE,
+    password VARCHAR(80) NOT NULL,
+    email VARCHAR(120) NOT NULL UNIQUE,
+    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
+);