task compile

default task
{
    // See https://go.microsoft.com/fwlink/?LinkId=733558
    // for the documentation about the tasks.json format
    "version": "2.0.0",
    "tasks": [
        {
            "label": "echo",
            "type": "shell",
            "command": "echo Hello"
        }
    ]
}

change to:

{
    // See https://go.microsoft.com/fwlink/?LinkId=733558
    // for the documentation about the tasks.json format
    "version": "2.0.0",
    "tasks": [
        {
            "taskName": "Compile Plugin",
            "type": "process",
            "command": "${workspaceRoot}\\amxxpc.exe",
            "args": [
                "${file}",
                "-i${workspaceRoot}\\include",
                "-o${workspaceRoot}\\compiled\\${fileBasenameNoExtension}.amxx"
            ],
            "group": {
                "kind": "build",
                "isDefault": true
            }
        }
    ]
}

settings - add your path.

{
    "amxxpawn.compiler.executablePath": "C:\\Users\\Admin\\Desktop\\D LOCAL\\compiler 1.9.0 custoM\\amxxpc.exe",
    "amxxpawn.compiler.includePaths": [
        "C:\\Users\\Admin\\Desktop\\D LOCAL\\compiler 1.9.0 custoM\\include"
    ]
}