Document build-, release- and lifecycle processes

[aheusingfeld]

Define above mentioned processes via plantuml sequence diagrams for curricula. Publish this documentation in https://github.com/isaqb-org/advanced-template/wiki and link to it in the https://github.com/isaqb-org/advanced-template/blob/master/README.adoc

NOTE: Lifecycle of an ISAQB curriculum should be documented in https://github.com/isaqb-org/github-readme rather than the WIKI of the template!

Relates to #45

[programming-wolf]

Also, define it so that it is easy to understand for curriculum curators

[programming-wolf]

Add explanation for release management and release candidates, Ideally add it to the README file.