Add a config to create new users on startup

README.md

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+## Generate new accounts on startup
+
+`--add-user` or `-a` can be used to create an account on startup. It requires a string following htpasswd format `[username]:[bcrypt hashed password]`.
+
+The password can be generated using `htpasswd -nB [username]`.
+
+For example, to create an user account `demo`:
+
+```bash
+htpasswd -nBC10 demo
+New password: 
+Re-type new password: 
+demo:$2y$10$UHR2646SZo2W.Rhna7bn5eWNLXWJZ/Sa3oLd9RlxlXs57Bwp6isOS
+```
+
+Then, starting the server:
+
+```
+./PersonalLibraryManager -a 'demo:$2y$10$UHR2646SZo2W.Rhna7bn5eWNLXWJZ/Sa3oLd9RlxlXs57Bwp6isOS'
+```
+
+This will create on startup a new demo user if it does not exist already. Like every parameter, you can also edit `add-user` in the configuration file.