Hello! I'm new to the forums, but I wanted to have some fun with a project, namely adding hitmarkers to the game (MW2 style, I'm feeling nostalgic) and I was wondering if it could possibly be done via XNB, or how I might implement it with SMAPI. I'm rather inexperienced with C# but have experience in java. Any help would be greatly appreciated!
It's not possible as an XNB mod, but you could do it with SMAPI. You should be fine writing C#, since it's very similar to Java. See creating a SMAPI mod on the wiki for the introductory tutorial, but you'll need to delve deeper to add the hit marks. I suggest asking in #modding in the Stardew Valley Discord; there are a lot of modders there who can point you in the right direction and answer your questions.