Create a use case documentation page for the explanation of different usage scenarion of kc-config-cli

[francis-pouatcha]

Use Cases:

• authenticatorConfig is ignored #1084
• Realm Import of file that has groups with IDs fail with 404 #877
• Ids in groups leads to "Create method returned status Not Found (Code: 404); expected status: Created (201)" #824
• Deleting built-in client roles? #849
• Remote state not used for managed scopes and scopeMappings #1012
• Support multiple post.logout.redirect.uris #800
• Support realms as configmaps as well #866
• otpPolicyAlgorithm ignored #847
• Support Partial Imports into Keycloak #1161
• Config update is very slow when there are 1000s of clients #1104
• PasswordPolicy HTTP 400 Bad Request  #906
• client roles case sensitivity #940
• Error when RoleRepresentation.getDescription() returns no description #970