chore: Add KeyCloak configuration (#9)

Co-authored-by: Aliaksandr Stsiapanay <[email protected]>

docs/keycloak.md

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+## KeyCloak Configuration
+
+Auth-helper uses token-exchange API in KeyCloak for access to external IdP. You need to grant permissions for the exchange
+before running auth-helper: https://www.keycloak.org/docs/latest/securing_apps/#_client_to_client_permission
+
+### Identity Provider
+Go to the target realm in KeyCloak and open "Identity Providers". Choose the tab "Mappers" and create two mappers:
+
+- *Idp*. The attribute denotes to the identity provider is used in KeyCloak. At the moment the valid value is "microsoft".
+- *IdpAlias*. The attribute denotes to the alias name of the IdP configured in KeyCloak.
+
+See the details below how to fill required fields in the mapper form to create mappers
+
+| Name     | Sync Mode Override  | Mapper Type         | User Attribute | User Attribute Value |
+|----------|---------------------|---------------------|-------------|----------------------|
+| Idp      | Force               | Hardcoded Attribute | idp         | microsoft            |
+| IdpAlias | Force               | Hardcoded Attribute | idpAlias    | <your_idp_alias>     |
+
+### Client Scope
+
+Go to "Client Scopes" in KeyCloak and choose the scope "dial". If the scope doesn't exist it should be created and be included to the client "chatbot-ui".
+
+Go to the tab "Mappers" and create two mappers:
+
+- *Idp*. Injects attribute value of "Idp" to the access token as a claim.
+- *IdpAlias*. Injects attribute value of "IdpAlias" to the access token as a claim.
+
+See the details below how to fill required fields in the mapper form to create mappers.
+
+| Name       | User Attribute | Token Claim Name | Claim JSON Type | Add to access token |
+|------------|----------------|------------------|-----------------|---------------------|
+| Idp        | idp            | idp              | String          | On                  |
+| Idp Alias  | idpAlias       | idpAlias         | String          | On                  |
+
+Note. The rest of flags should be turned off in the mapper form.
+