I got invitation for 190 nsw in January and I lodged my visa in February 2020. I came to India to visit my family in March and I didn’t (couldn’t) return yet? Can I get married now? And if I could, can I add the spouse to the already lodged visa?
The 190 visa approval will come with a clause to not marry before first arrival.
You can add your spouse to pending application but it may reduce your total points based on the situation.
See the sample 190 PR grant letter here.