update_maxima.md

+
+#add remote as upsteam
+
+Version ändern in 
+- hsh-custom-build.sh
+- hsh-custom-run.sh
+- goemaxima.service
+
+```bash
+# in vim :%s/<old version>/<new version/g
+:%s/2024012900/2024060300/g    
+:wq
+```