Ignore Markdown in jgit by default

Author: laeubi

eclipse-platform-parent/pom.xml

@@ -420,6 +420,8 @@
               pom.xml
               .polyglot.build.properties
               .gitignore
+              *.md
+              *.MD
             </jgit.ignore>
             <jgit.dirtyWorkingTree>${jgit.dirtyWorkingTree-platformDefault}</jgit.dirtyWorkingTree>
             <sourceReferences>