Add checkstyle screenshot (and lint guidelines-...md)

docs/guidelines-for-setting-up-a-local-workspace.md

@@ -29,9 +29,9 @@ If you do not yet have a GitHub account, please [create one](https://github.com/
 
 Proposals for account names:
 
-- Login similar to your university account. Example: `koppor`
-- Use your last name prefixed by the first letter of your first name. Example: `okopp`
-- Use `firstname.lastname`. Example: `oliver.kopp`
+* Login similar to your university account. Example: `koppor`
+* Use your last name prefixed by the first letter of your first name. Example: `okopp`
+* Use `firstname.lastname`. Example: `oliver.kopp`
 
 You can hide your email adress by following the recommendations at <https://saraford.net/2017/02/19/how-to-hide-your-email-address-in-your-git-commits-but-still-get-contributions-to-show-up-on-your-github-profile-050/>.
 
@@ -41,9 +41,9 @@ That account then be used for develoment mailing lists, mail exchange with other
 
 Examples:
 
-- Same login as in GitHub (see above). Example: `[email protected]`
-- "`it`" in the name. Example:  `[email protected]`
-- Use the university login. Example: `[email protected]`
+* Same login as in GitHub (see above). Example: `[email protected]`
+* "`it`" in the name. Example:  `[email protected]`
+* Use the university login. Example: `[email protected]`
 
 ### git
 
@@ -172,15 +172,18 @@ Contributions to JabRef's source code need to have a code formatting that is con
   2. Close the settings afterwards and restart IntelliJ
 * Go to **File \| Settings \| Editor \| Code Style**
 * Click on the settings wheel \(next to the scheme chooser\), then click "Import Scheme"
-* Select the IntelliJ configuration file `config/IntelliJ Code Style.xml`.
+* Select the IntelliJ configuration file `config/IntelliJ Code Style.xml`
 * Go to **File \| Settings \| Checkstyle \| Configuration File**
   1. Import the CheckStyle configuration file by clicking the \[+\] button
-  2. For the description provide e.g. "JabRef"
+  2. For the description provide "JabRef"
   3. Click "Browse" and choose `config/checkstyle/checkstyle.xml`
   4. Check "Store relative to project location"
   5. Click "Next" and "Finish"
   6. Activate the CheckStyle configuration file by ticking it in the list
-  7. Save settings by clicking "OK"
+  7. Ensure that CheckStyle version 8.31 (or higher) is selected
+  8. Save settings by clicking "OK"
+
+![checkstyle settings](images/intellij-checkstyle-settings.png)
 
 #### Troubleshooting when using both IDEA and Eclipse
 
@@ -200,7 +203,7 @@ For Eclipse 2020-03 you need to install [jdk14 support](https://marketplace.ecli
 1. Run `./gradlew run` to generate all resources and to check if JabRef runs.
    * The JabRef GUI should finally appear.
    * This step is only required once.
-2. Run `./gradlew eclipse` 
+2. Run `./gradlew eclipse`
    * **This must always be executed, when there are new upstream changes.**
 3. Copy the file `Log4jPlugins.java` from `build/generated/sources/annotationProcessor/java/main/org/jabref/gui/logging/plugins` to `src/main/java/org/jabref/gui/logging/plugins/`
    * Usually, the folder `plugins` must be created for that.
@@ -210,29 +213,28 @@ For Eclipse 2020-03 you need to install [jdk14 support](https://marketplace.ecli
 5. Create a run/debug configuration for the main class `org.jabref.JabRefLauncher` and/or for `org.jabref.JabRefMain` \(both can be used equivalently\)
    * In the tab "Arguments" of the run/debug configuration, enter the following runtime VM arguments:
 
-     * Set "VM Arguments" to:
-
-     ```text
-     --patch-module test=fastparse_2.12-1.0.0.jar
-     --patch-module test2=fastparse-utils_2.12-1.0.0.jar
-     --patch-module test3=sourcecode_2.12-0.1.4.jar
-     --add-exports javafx.controls/com.sun.javafx.scene.control=org.jabref
-     --add-exports org.controlsfx.controls/impl.org.controlsfx.skin=org.jabref
-     --add-exports javafx.graphics/com.sun.javafx.scene=org.controlsfx.controls
-     --add-exports javafx.graphics/com.sun.javafx.scene.traversal=org.controlsfx.controls
-     --add-exports javafx.graphics/com.sun.javafx.css=org.controlsfx.controls
-     --add-exports javafx.controls/com.sun.javafx.scene.control.behavior=org.controlsfx.controls
-     --add-exports javafx.controls/com.sun.javafx.scene.control=org.controlsfx.controls
-     --add-exports javafx.controls/com.sun.javafx.scene.control.inputmap=org.controlsfx.controls
-     --add-exports javafx.base/com.sun.javafx.event=org.controlsfx.controls
-     --add-exports javafx.base/com.sun.javafx.collections=org.controlsfx.controls
-     --add-exports javafx.base/com.sun.javafx.runtime=org.controlsfx.controls
-     --add-exports javafx.web/com.sun.webkit=org.controlsfx.controls
-     --add-exports javafx.graphics/com.sun.javafx.css=org.controlsfx.controls
-     --add-exports javafx.controls/com.sun.javafx.scene.control.behavior=com.jfoenix
-     --add-exports com.oracle.truffle.regex/com.oracle.truffle.regex=org.graalvm.truffle
-     --patch-module org.jabref=build\resources\main
-     ```
+        ```text
+        --patch-module test=fastparse_2.12-1.0.0.jar
+        --patch-module test2=fastparse-utils_2.12-1.0.0.jar
+        --patch-module test3=sourcecode_2.12-0.1.4.jar
+        --add-exports javafx.controls/com.sun.javafx.scene.control=org.jabref
+        --add-exports org.controlsfx.controls/impl.org.controlsfx.skin=org.jabref
+        --add-exports javafx.graphics/com.sun.javafx.scene=org.controlsfx.controls
+        --add-exports javafx.graphics/com.sun.javafx.scene.traversal=org.controlsfx.controls
+        --add-exports javafx.graphics/com.sun.javafx.css=org.controlsfx.controls
+        --add-exports javafx.controls/com.sun.javafx.scene.control.behavior=org.controlsfx.controls
+        --add-exports javafx.controls/com.sun.javafx.scene.control=org.controlsfx.controls
+        --add-exports javafx.controls/com.sun.javafx.scene.control.inputmap=org.controlsfx.controls
+        --add-exports javafx.base/com.sun.javafx.event=org.controlsfx.controls
+        --add-exports javafx.base/com.sun.javafx.collections=org.controlsfx.controls
+        --add-exports javafx.base/com.sun.javafx.runtime=org.controlsfx.controls
+        --add-exports javafx.web/com.sun.webkit=org.controlsfx.controls
+        --add-exports javafx.graphics/com.sun.javafx.css=org.controlsfx.controls
+        --add-exports javafx.controls/com.sun.javafx.scene.control.behavior=com.jfoenix
+        --add-exports com.oracle.truffle.regex/com.oracle.truffle.regex=org.graalvm.truffle
+        --patch-module org.jabref=build\resources\main
+        ```
+
 6. Optional: Install the [e\(fx\)clipse plugin](http://www.eclipse.org/efxclipse/index.html) from the Eclipse marketplace: 1. Help -&gt; Eclipse Marketplace... -&gt; Search tab 2. Enter "e\(fx\)clipse" in the search dialogue 3. Click "Go" 4. Click "Install" button next to the plugin 5. Click "Finish"
 7. Now you can build and run/debug the application by either using "JabRefLauncher" or "JabRefMain". This is the recommended way, since the application starts quite fast.