Added build script and version command

internal/cli/version.go

@@ -0,0 +1,26 @@
+package cli
+
+import (
+	"fmt"
+
+	"git.avsdev.uk/Go/go-ocds/internal/version"
+	"github.com/spf13/cobra"
+)
+
+func newVersionCmd() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "version",
+		Short: "Print version information",
+		Run: func(cmd *cobra.Command, args []string) {
+			fmt.Printf("ocdsgen - %s\n", version.Version)
+			if version.BuildTime != "unknown" {
+				fmt.Printf("Built: %s\n", version.BuildTime)
+			}
+			if version.GitCommit != "unknown" {
+				fmt.Printf("Commit: %s\n", version.GitCommit)
+			}
+		},
+	}
+
+	return cmd
+}