add spellcheck

Jenkinsfile

@@ -70,10 +70,11 @@ pipeline {
           }
         }
 
-      stage('update repo structure') {
+      stage('spell check') {
         steps {
-          sh '''rm -Rf REPOSTRUCTURE.md
-                echo "$(tree --dirsfirst --charset=ascii .)" > REPOSTRUCTURE.md'''
+          sh '''
+          mdspell -r -n -a "**/*.md"
+          '''
         }
       }