Spotless plugin - format .md files

Author: slachiewicz

README.md

@@ -1,5 +1,5 @@
 Plexus Parent POM
-============
+=================
 
 [![Maven Central](https://img.shields.io/maven-central/v/org.codehaus.plexus/plexus.svg?label=Maven%20Central)](https://search.maven.org/artifact/org.codehaus.plexus/plexus)
 

pom.xml

@@ -602,6 +602,15 @@ limitations under the License.
                 <spaceBeforeCloseEmptyElement>true</spaceBeforeCloseEmptyElement>
               </sortPom>
             </pom>
+            <markdown>
+              <includes>
+                <include>**/*.md</include>
+              </includes>
+              <excludes>
+                <excludes>target/**</excludes>
+              </excludes>
+              <flexmark />
+            </markdown>
             <upToDateChecking>
               <enabled>true</enabled>
             </upToDateChecking>