add more descriptions (#48)

Reviewed-on: #48
Reviewed-by: Gode, Sebastian <sebastian.gode@t-systems.com>
Co-authored-by: tischrei <tino.schreiber@t-systems.com>
Co-committed-by: tischrei <tino.schreiber@t-systems.com>

otc_metadata/data/services/cbr.yaml

@@ -12,3 +12,4 @@ cloud_environments:
     visibility: public
   - name: swiss
     visibility: public
+description: Cloud Backup and Recovery (CBR) allows you to back up cloud disks, elastic cloud servers, and bare metal servers, protecting the security and accuracy of your data to the greatest extent for service security.

otc_metadata/data/services/iam.yaml

@@ -12,3 +12,4 @@ cloud_environments:
   - name: swiss
     visibility: public
 is_global: false
+description: Identity and Access Management (IAM) provides a public cloud system (Open Telekom Cloud) with user identity management and access control.

otc_metadata/data/services/vpc.yaml

@@ -12,3 +12,4 @@ cloud_environments:
   - name: swiss
     visibility: public
 is_global: false
+description: The Virtual Private Cloud (VPC) service enables you to provision logically isolated, configurable, and manageable virtual networks for Elastic Cloud Servers (ECSs), improving the security of resources in the cloud system and simplifying network deployment.