added documentation re the Spring gradle plugin

README.md

@@ -33,4 +33,23 @@ dependency:
 You might find an example for different use cases in this [documentation](HowTo.md). As this documentation is generated
 on each build by running this code, it should work as expected:)
 
-
+### Spring Gradle Plugin io.spring.dependency-management
+
+The Spring gradle plugin `io.spring.dependency-management` sets a plethora of dependencies to particular versions.
+One of its dependency management coordinates is `de.flapdoodle.embed:de.flapdoodle.embed.mongo:3.4.11`.
+The recommended way to overwrite this dependency management coordinate set by the Spring gradle plugin
+`io.spring.dependency-management` is to add the following code block to your `build.gradle`:
+```
+dependencyManagement {
+    dependencies {
+        dependency group:'de.flapdoodle.embed', name:'de.flapdoodle.embed.mongo', version:'4.3.1'
+    }
+}
+```
+You can then check whether this was successful by listing the dependency management coordinates managed by the
+Spring gradle plugin `io.spring.dependency-management`:
+```
+gradle dependencyManagement
+```
+This is no longer an issue in Spring Boot version 3.0.0 and later as the dependency management coordindate for
+`de.flapdoodle.embed:de.flapdoodle.embed.mongo` was removed.