SB: Provide e2e tutorial in the KEB repo with Provisioning API service usage and create Kyma and credentials without user actions in the frontend

[PK85]

Subtask of the EPIC: #284

AC

• 0.1) Find a place for a document in the opensource, suggestion: KEB repository in the docs/user
• 0.2) Find a place for a document in the help.sap, suggestion: link :)](https://help.sap.com/docs/btp/sap-business-technology-platform/development-in-kyma-environment) ask Iwona for more details @IwonaLanger
• 1) provide documentation/tutorial when user must create Provisioning instance and bindings and then create kyma and get access to the cluster from service binding credentials

[ralikio]

Current docs in Kyma Doc is provisioning-skr-via-cis-provisioning-API.md done by @KsaweryZietara