Minimal F# project

.vscode launch.json

{
	"configurations": [
		{
			"args": [],
			"console": "internalConsole",
			"cwd": "${workspaceFolder}",
			"name": ".NET Core Launch (console)",
			"preLaunchTask": "build",
			"program": "${workspaceFolder}/bin/Debug/netcoreapp3.0/fsql.dll",
			"request": "launch",
			"stopAtEntry": false,
			"type": "coreclr"
		}
	],
	"version": "0.2.0"
}

.vscode tasks.json

{
	"tasks": [
		{
			"args": [
				"build",
				"/property:GenerateFullPaths=true",
				"/consoleloggerparameters:NoSummary"
			],
			"command": "dotnet",
			"group": "build",
			"label": "build",
			"presentation": {
				"reveal": "silent"
			},
			"problemMatcher": "$msCompile",
			"type": "shell"
		}
	],
	"version": "2.0.0"
}

my.fsproj

<Project Sdk="Microsoft.NET.Sdk">
	<PropertyGroup>
		<OutputType>Exe</OutputType>
		<TargetFramework>netcoreapp3.0</TargetFramework>
	</PropertyGroup>

	<ItemGroup>
		<Compile Include="Program.fs" />
	</ItemGroup>
</Project>

Program.fs

open System

[<EntryPoint>]
let main argv =
    printfn "Hello World from F#!"
    0 // return an integer exit code