add local dev info to readme

Author: SirCotare

readme.md

@@ -20,6 +20,14 @@ Add this library to the classpath by adding the following maven dependency. Vers
 The [CustomAccessorNamingStrategy.java](src%2Fmain%2Fjava%2Fit%2Faboutbits%2Fmapstruct%2Fspi%2FCustomAccessorNamingStrategy.java) adds support for Lombok's `@With` methods.
 By default, Lombok would treat these generated functions as accessors and would try to map them.
 
+## Local development:
+
+To use this library as a local development dependency, you can simply refer to the version `BUILD-SNAPSHOT`.
+
+Check out this repository and run the maven goal `install`. This will build and install this library as version `BUILD-SNAPSHOT` into your local maven cache.
+
+Note that you may have to tell your IDE to reload your main maven project each time you build the library.
+
 ## Building and releasing a new version:
 
 To create a new version of this package and push it to the maven registry, you will have to use the GitHub actions workflow and manually trigger it.