LittleActivityPub is a minimal and incomplete implementation of an ActivityPub server, for didactic purposes.
A secondary goal of this project is to move sending message on the client side.
Place the lap_src directory and the .well-known one in the document root of your web server. Now the LittleActivityPub server will be available at http(s)://yourdomain.org/lap_src.
In addition, ensure that your web server have permissions to create a lap_users directory under the document root.