feat(cli,packagemanager): implemented first working windows and macos versions

in order to implement sst for windows and macos the structure of
osmanager has been changed.
Now osmanager has a new field pm, which contains the specific
packagemanager for the os.
Linux packagemanagers have been implemented as packagemanagers on their
own.

cmd/search_cmd.go

@@ -2,6 +2,8 @@ package cmd
 
 import (
 	"fmt"
+	"log"
+	"runtime"
 	"strings"
 
 	pm "system_setup_tool/packagemanager"
@@ -22,10 +24,26 @@ var searchCmd = &cobra.Command{
 			managerName = "homebrew"
 		}
 
-		managers := []pm.PackageManager{
-			pm.NewOSManager(""),
-			&pm.HomebrewManager{},
-			&pm.FlatpakManager{},
+		var managers []pm.PackageManager
+		switch runtime.GOOS {
+		case "linux":
+			managers = []pm.PackageManager{
+				pm.NewOSManager(""),
+				&pm.HomebrewManager{},
+				&pm.FlatpakManager{},
+			}
+		case "windows":
+			managers = []pm.PackageManager{
+				pm.NewOSManager(""),
+				&pm.WingetManager{},
+				&pm.ChocoManager{},
+			}
+		case "darwin":
+			managers = []pm.PackageManager{
+				pm.NewOSManager(""),
+			}
+		default:
+			log.Println("No Package Managers found")
 		}
 
 		if managerName != "" {