credential store API docs — add example of get

platform/credential-store/readme.md

@@ -36,4 +36,8 @@ API allows you to get credentials only by service name.
 See `CredentialStore`. API has two methods:
 
 * `get`: Pass service name and user name. Or only service name — in this case first matched entry will be returned.
-* `set`: Pass credentials attributes and credentials.
+* `set`: Pass credentials attributes and credentials.
+
+```kotlin
+PasswordSafe.instance.get(CredentialAttributes(generateServiceName("Subsystem", "sub key"), username))
+```

platform/platform-api/src/com/intellij/credentialStore/CredentialAttributes.kt

@@ -7,6 +7,9 @@ import org.jetbrains.annotations.Contract
 
 const val SERVICE_NAME_PREFIX = "IntelliJ Platform"
 
+/**
+ * [See documentation](https://github.com/JetBrains/intellij-community/blob/master/platform/credential-store/readme.md#service-name)
+ */
 fun generateServiceName(subsystem: String, key: String) = "$SERVICE_NAME_PREFIX $subsystem — $key"
 
 /**