Maintenance and contribution help proposal

[twdragon]

Dear all, especially @wohe @ksavinash9 working for some time with Cartographer, I saw that the project seemed deteriorating as it is not maintained. Is it possible to suggest help in the maintenance and contributions? Especially it could be done as the project is important for the ROS community as it is described here. In case yes, I can suggest you my help in the maintenance of the repositories