Add howto for "Build and run using IntelliJ IDEA"

docs/getting-into-the-code/guidelines-for-setting-up-a-local-workspace/intellij-89-run-with-intellij.md

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+---
+parent: Set up a local workspace
+grand_parent: Getting into the code
+nav_order: 89
+---
+
+# Advanced: Build and run using IntelliJ IDEA
+
+In "Step 2: Setup the build system: JDK and Gradle", IntelliJ was configured to use Gradle as tool for launching JabRef.
+It is also possible to use IntelliJ's internal build and run system to launch JabRef.
+Due to [IDEA-119280](https://youtrack.jetbrains.com/issue/IDEA-119280), it is a bit more work.
+
+1. Navigate to **File > Settings... > Build, Execution, Deployment > Build Tools > Gradle**.
+2. Change the setting "Build an run using:" to "IntelliJ IDEA".
+3. **Build > Build Project**
+4. Open the project view (<kbd>Alt</kbd>+<kbd>1</kbd>)
+5. Copy all build resources to the folder of the build classes
+   1. Navigate to the folder `out/production/resources`
+   2. Select all folders below (`bst`, `csl-locales`, ...)
+   3. Press <kbd>Ctrl</kbd>+<kbd>C</kbd> to mark them for copying
+   4. Select the folder `classes`
+   5. Press <kbd>Ctrl</kbd>+<kbd>V</kbd> to start the copy process
+6. Locate the class `Launcher` (e.g., by <kbd>ctrl</kbd>+<kbd>N</kbd> and then typing `Launcher`)
+7. Click on the green play button next to the `main` method to create a Launch configuration. IntelliJ will fail in launching.
+8. On the top right of the IntelliJ window, next to the newly created launch configuration, click on the drop down
+9. Click on "Edit Configurations..."
+10. On the right, click on "Modify options"
+11. Ensure that "Use classpath of module" is checked
+12. Select "Add VM options"
+13. In the newly appearing field for VM options, insert:
+
+   ```text
+   --add-exports=javafx.controls/com.sun.javafx.scene.control=org.jabref
+   --add-opens=org.controlsfx.controls/org.controlsfx.control.textfield=org.jabref
+   --add-exports=org.controlsfx.controls/impl.org.controlsfx.skin=org.jabref
+   --add-reads org.jabref=org.fxmisc.flowless
+   --add-reads org.jabref=org.apache.commons.csv
+   ```
+
+14. Click "Apply"
+15. Click "Run"