Add support for custom modpack

[candid sentinel]

It would be nice to have a button to add "Custom Modpacks" in lunar, by selecting the version and then click this button it will open a folder were we can add our modpacks, and then it will show in lunar like any other modpacks

[restive jolt]

already there u can add ur own mods by using /modloading
command here in discord

[still granite]

modpack is different

and it looks nicer if it is in the modrinth menu