Add docker container definition

Change-Id: If32020e6b8e8bb816eb54533554b18cc5302b5c9
diff --git a/credentials.php b/credentials.php
new file mode 100644
index 0000000..600bfa5
--- /dev/null
+++ b/credentials.php
@@ -0,0 +1,31 @@
+<?php
+
+class Credentials {
+	public static function servername() {
+		return getenv('DB_SERVERNAME');
+	}
+
+	public static function username() {
+		return getenv('DB_USERNAME');
+	}
+
+	public static function password() {
+		return getenv('DB_PASSWORD');
+	}
+
+	public static function dbname() {
+		return getenv('DB_NAME');
+	}
+
+	public static function usersdb() {
+		return getenv('DB_USERS_DB');
+	}
+
+	public static function mortsdb() {
+		return getenv('DB_MORTS_DB');
+	}
+
+	public static function adminToken() {
+		return getenv('ADMIN_TOKEN');
+	}
+};