Please include instructions and examples on how to compile in README.md

[davehouser1]

Please include basic instructions on how to compile this package. I know all systems are different, and preferences play a large part in how one wants to granularly control ./configure however I feel it is helpful to share basic method to compile your code. This maybe straight forward for other developers. However anyone that is not accustomed to using Linux or programming may not know how what to do after they clone the repo. Would recommend including the following:

To compile the code and install do the following

$ ./autogen.sh
$ ./configure
$ ./make
$ sudo ./make install

To check install run

$ systemctl status ssdp.service
$ ./check.sh

To start the service

$ sudo systemctl start ssdpd.service

To stop

$ sudo systemctl stop ssdp.service