Added documentation on how to build the library in a new, initial section of the \mainpage docs.
Added documentation on how to build the library in a new, initial section
of the \mainpage docs.

alex-quiterio/infact,alex-quiterio/infact,julianromera/infact,julianromera/infact,julianromera/infact,alex-quiterio/infact,julianromera/infact,alex-quiterio/infact,google/infact,google/infact,julianromera/infact,alex-quiterio/infact