Add to the spec glossary/dictionary : Application Projection and ServiceBindingProjection

[cmoulliard]

Proposition

Cou you please add the spec glossary/dictionary the following entries Application Projection and ServiceBindingProjection and that you explain what is a Projection, an application Projection and ServiceBindingProjection

Some more concrete examples should help

[navidsh]

Discussed this during the community call. This would be a great candidate to be added to the user guide (#84) OR as a section in the spec.

[nebhale]

Included in #9 scope.