add login, logout, and change password pages

change password allows a user to set their own password, superadmin can change anyones password

html/form_login.php

@@ -0,0 +1,17 @@
+<?php
+session_start();
+?><html>
+<head>
+<title>SWG:Source | Login</title>
+<meta name = "viewport" content = "width = device-width">
+<meta name = "viewport" content = "initial-scale = 1.0">
+</head>
+<body>
+<center><img src="images/swgsource.png" alt="" width=200/></center>
+<form method="post" action="post_login.php">
+  <center><p>Username: <input name="username" type="text"></p>
+<p>Password: <input name="password" type="password"></p>
+<input name="submit" type="submit" value="Submit"></center>
+</form>
+</body>
+</html>