Add section to readme how to enable m2e support

Author: kwin

plugin-maven/README.md

@@ -1696,6 +1696,26 @@ cmd> mvn spotless:apply -DspotlessFiles=my/file/pattern.java,more/generic/.*-pat
 
 The patterns are matched using `String#matches(String)` against the absolute file path.
 
+## Does Spotless support incremental builds in Eclipse
+
+Spotless comes with [m2e](https://eclipse.dev/m2e/) support. However by default its execution is skipped by default in incremental builds. To enable it use the following parameter.
+
+```
+<configuration>
+    <enableForIncrementalBuild>true</enableForIncrementalBuild><!-- this is false by default -->
+</configuration>
+```
+
+In addition Eclipse problem markers are being emitted. By default they have the severity `WARNING`.
+You can adjust this with 
+
+```
+<configuration>
+    <incrementalBuildMessageSeverity>ERROR</incrementalBuildMessageSeverity><!-- WARNING or ERROR -->
+</configuration>
+```
+Note that for Incremental build support the goals have to be bound to a phase prior to `test`.
+
 <a name="examples"></a>
 
 ## Example configurations (from real-world projects)