code_samples/max_opened_project: README minor

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Yann Cébron 2021-02-23 16:03:06 +01:00
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## Quickstart
Maximum Open Projects Sample implements a `ProjectManagerListener` with two methods applied to check if the current projects have been opened or closed.
Each method refers to the `ProjectCountingService` service registered as an `applicationService` extension point.
Each method refers to the `ProjectCountingService` service registered as an `com.intellij.applicationService` extension point.
It provides methods to increase and decrease the global counter of the currently opened projects in the IDE.
After opening each one, a message dialog is presented to the user with the current number.