installer: clean up codebase

* introduce helper soft package to work with SoftServe
* move commands to cmd/
diff --git a/core/installer/cmd/main.go b/core/installer/cmd/main.go
new file mode 100644
index 0000000..9b7a6ba
--- /dev/null
+++ b/core/installer/cmd/main.go
@@ -0,0 +1,34 @@
+package main
+
+import (
+	"log"
+
+	"github.com/spf13/cobra"
+)
+
+var rootCmd *cobra.Command
+
+var rootFlags struct {
+	kubeConfig string
+}
+
+func init() {
+	rootCmd = &cobra.Command{
+		Use: "pcloud",
+	}
+	rootCmd.PersistentFlags().StringVar(
+		&rootFlags.kubeConfig,
+		"kubeconfig",
+		"",
+		"",
+	)
+	rootCmd.AddCommand(bootstrapCmd())
+	rootCmd.AddCommand(createEnvCmd())
+	rootCmd.AddCommand(installCmd())
+}
+
+func main() {
+	if err := rootCmd.Execute(); err != nil {
+		log.Fatal(err)
+	}
+}