[docs] Updating README.md
[docs] Updating README.md

Updating README section regarding contributions, and added a link to CONTRIBUTING.md

renanmpimentel/azk,renanmpimentel/azk,juniorribeiro/azk,juniorribeiro/azk,teodor-pripoae/azk,slobo/azk,fearenales/azk,gullitmiranda/azk,azukiapp/azk,azukiapp/azk,teodor-pripoae/azk,marcusgadbem/azk,agendor/azk,heitortsergent/azk,agendor/azk,gullitmiranda/azk,saitodisse/azk,nuxlli/azk,fearenales/azk,saitodisse/azk,nuxlli/azk,slobo/azk,Klaudit/azk,heitortsergent/azk,marcusgadbem/azk,Klaudit/azk