add users to database

readme.md

@@ -127,7 +127,7 @@ The required schema in the database is
 	    topic VARCHAR(256) NOT NULL,
 	    rw INTEGER(1) NOT NULL DEFAULT 1,	-- 1 is read, 2 is write, 3 is readwrite, 4 is subscribe
 	    PRIMARY KEY (id),
-	    CONSTRAINT `fk_book_author`
+	    CONSTRAINT `fk_users_user`
 	      FOREIGN KEY (user) REFERENCES users_t (id)
 	      ON DELETE CASCADE
 	      ON UPDATE CASCADE
@@ -145,6 +145,10 @@ The password is generated using the `pw` tool provided by mosquitto-go-auth, whi
 
 For further information consult the readme and the examples in the mosquitto-go-auth project (https://github.com/iegomez/mosquitto-go-auth or https://github.com/wollud1969/mosquitto-go-auth).
 
+For MariaDB and PostgreSQL there are prepared table create statements in the repository,
+
+For PostgresSQL there is a prepared Python tool in the directory `tools` available to added users into the database.
+
 
 ## Preparing configuration and certificates