adding the sum method to Main.rb and sub method
adding sum test description and sub dsecription
testing suma method and resta method
Merge branch 'develop' of github.com:Tille/calc_quibdo into Basicas
Issue: #3 testing suma method and resta method
changin README.md, add description to how to implement methods suma and resta
Issue: #3 added and testing new multiplication method
Issue: #3 made change suggested by the team at lines 13 to 16 inside main_spect.rb
Issue: #10 adding new documentation about implementing multiplication method
Merge pull request #7 from Tille/Basicas

Basicas