METRICO Documentation (fix for #14)

doc/architecture/cridge.md

doc/architecture/images/cridge/img01.png

doc/architecture/images/cridge/img02.png

doc/architecture/images/cridge/img03.png

doc/architecture/images/cridge/img04.png

doc/architecture/images/cridge/img05.png

...architecture/images/metrico/metrico_arch_introduction.png

...cture/images/metrico/metrico_service_sequence_diagram.png

doc/architecture/messagebus.md

doc/architecture/metrico.md

doc/architecture/nfvapi.md

doc/architecture/oauth.md

doc/architecture/tmfapi.md

..._design/examples/calculator_crd_aas/calculator_crd_aas.md

...ples/jenkins_helm_install_aas/jenkins_helm_install_aas.md

...monitoring_aas/images/edit_cfs_service_characteristic.png

...n/examples/monitoring_aas/images/exposed_metrico_cfss.png

...ce_design/examples/monitoring_aas/images/metrico_cfss.png

...es/monitoring_aas/images/metrico_cfss_characteristics.png

...ples/monitoring_aas/images/metrico_cfss_creation_rule.png