New forms for joining SDM community

The last option of the menu, now include the forms to join the SDM community in the different roles:

Board Member: Organization managing the SDM together with the existing members FIAWRE, TMForum, IUDX and OASC

Contributor: People who bring new / update data models

Adopter: Organization or project using some of the data models

User: People willing to be informed about the updates on the Smart Data Models initiative