1.8 Shaders config

Use 7-Zip to extract the core.jar and asm.jar. Then go to your MultiMC folder, libraries, then create these folders inside of each other. First shaders, then Shaders, then the version (I'm using 2.4.1 so I type v2.4.1). Mind the capitalization. Paste the asm.jar and Shaders-Core.jar. Make sure to rename the shaders jar to: Shaders-[version].jar. Mine reads Shaders-v2.4.1.jar. After that go to the folder for your 1.8 instance. There should be two folders, minecraft and patches. If there isn't patches, create it. Next create the file shaders.json. MAKE SURE that the extension is .json and not .txt. Paste in all of this text below, changing the version to the shaders version you are using. Save and close everything. Boot up MultiMC, go to the instance and add asm.jar and shaders-core.jar we added earlier. There should also be a third file on that list, if you don't see it, click 'reset order' or try restarting.
COPY THIS ONLY:
{
    "+libraries": [
        {
            "insert": "prepend",
            "name": "net.minecraft:launchwrapper:1.8"
        },
        {
            "insert": "prepend",
            "MMC-depend": "hard",
            "MMC-hint": "local",
            "name": "shaders:Shaders:v2.4.1"
        }
    ],
    "+tweakers": [ "shadersmod.launch.SMCTweaker" ],
    "fileId": "shaders.Shaders",
    "mainClass": "net.minecraft.launchwrapper.Launch",
    "mcVersion": "1.8",
    "minecraftArguments": "--username ${auth_player_name} --version ${version_name} --gameDir ${game_directory} --assetsDir ${assets_root} --assetIndex ${assets_index_name} --uuid ${auth_uuid} --accessToken ${auth_access_token} --userProperties ${user_properties} --userType ${user_type} ",
    "name": "Shaders",
    "order": 200,
    "version": "v2.4.1"
}