Update ReadMe

README.md

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 # ROS2-systemctl Node: 
 **systemctl** is a command line utility that is used to control and manage system services on Linux operating system.
 This Node enables the communication with **systemctl** using basic ROS2 services (std_srvs::srv::Request). It allows the user to start, stop, restart and visualize the status of a specific system service.
-In order to function correctly as a normal user, the custom Systemd unit file has to be generated in the **~/.config/systemd/user/** directory.
-In the params file the names of the systemd services can be set as a simple list omitting the .service extension of the name.
-Similarly, it is possible to change the name of the ROS2 services in order to make node integration and customization easier.
+## How to Use:
+- In order to function correctly as a normal user, the custom Systemd unit file has to be generated in the `~/.config/systemd/user/` directory.
+- In the params file the names of the systemd services can be set as a simple list **omitting** the .service extension of the name.
+- Similarly, it is possible to change the name of the ROS2 services in order to make node integration and customization easier.