That's rather hopeless idea. One has to have an intermediate experience in Java programming to make decent mods, which is gained by making at least one qualitative application. We have Forge + custom Gradle plugin bundle, so it also necessary to know at least basic Gradle stuff.I have another idea, one that seems like it should already exist, but I haven't heard anything about. It's not so much a mod as it is a way to make creating mods easier. Is there an IDE for Minecraft modding (or a program like the "creation kit" that Bethesda has) or a plugin for an existing IDE? If not it might be helpful for people who want to mod, and it might make modding more accessible if such a thing were to exist. Like the LoL mod I suggested above it would take a lot of work and probably coding wizardry. I have neither the skill nor experience to do such a thing, but I thought it might be interesting to suggest nonetheless. I know they had a "create your own mod" kind of thing, but from what I remember it didn't allow for much in the way of creating dimensions or new biomes or adding new mechanics like what Thaumcraft or Blood Magic does. If such a utility exists I'd like to know so that I can check it out. I've always wanted to get into modding myself but the sheer amount of stuff for a complete beginner to learn is massive. I think having access to a tool that allows basic infrastructure to be set up and maybe allow for importing well known mods for the purpose of creating add-ons would be kinda cool and useful.
Making a dedicated minecraft modding IDE would be an 'overkill', IMO, and a waste of effort.
We have main IDEs to choose - Eclipse and Intellij. I prefer Intellij for its stability and convenience.
I must admit my 'sin' - I started modding without having any programming experience at all, and I had to invest a lot of time - months - in learning Java and, later, Gradle. Naturally, I have made lots of mistakes. But when I actually tried making a serious Java application, it boosted my skills and helped in developing minecraft mods.
So I'd advise you to go step-by-step: learn Java; learn Gradle; optionally, learn Groovy; develop a fully working application; then learn minecraft modding. It's a safer route. No need for 'mod-making' apps and such.