feat: add version command

Signed-off-by: cpendery <cpendery@vt.edu>

cmd/version.go

@@ -0,0 +1,27 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+var (
+	version string
+)
+
+func init() {
+	rootCmd.AddCommand(versionCmd)
+}
+
+var versionCmd = &cobra.Command{
+	Use:   "version",
+	Short: "view clac's version",
+	Args:  cobra.ExactArgs(0),
+	RunE:  runVersionCmd,
+}
+
+func runVersionCmd(_ *cobra.Command, args []string) error {
+	fmt.Printf("clac version: %s", version)
+	return nil
+}