make reading contact data from socialmixr one episode

from feedback "More time to be familiar with {socialmixr}, structure of contact data. More familiar with functions"

Also, we can show flexibility of the social contact matrix to any input different from the socialmixr package, like socio economic status (SES), or geographical regions. "The contact matrix can represent any demographic group. Spatial structure is implicitly supported as groups could be regions and the contact matrix is the mobility matrix."