If you mean to add the title of a publication in Marathi language, just copy the text when creating a page for a publication. As an example, see titles in cyrillic font in this profile: https://www.researchgate.net/profile/Irina-Pechonkina. See also this help page for instructions how to add published or unpublished research to ResearchGate: https://help.researchgate.net/hc/en-us/articles/14293005132305-How-to-add-research