add simple main runnable

src/cmd/main/main.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"github.com/garciat/gobid/check"
+	"github.com/garciat/gobid/compile"
+	"io"
+	"os"
+)
+
+func main() {
+	unit := compile.NewCompilationUnit("main")
+	for _, arg := range os.Args[1:] {
+		switch arg {
+		case "-v":
+			*check.DebugAll = true
+		case "-":
+			stdin, err := io.ReadAll(os.Stdin)
+			if err != nil {
+				panic(err)
+			}
+			unit.AddSource("stdin.go", stdin)
+		default:
+			unit.AddFile(arg)
+		}
+	}
+	unit.Compile()
+}