Update package and commands with version info

cmd/root.go

@@ -13,6 +13,7 @@ import (
 	"strings"
 
 	"github.com/guigolab/rnaget-client/pkg/api"
+	"github.com/guigolab/rnaget-client/pkg/version"
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
@@ -37,6 +38,7 @@ var (
 		Use:              "rnaget-client",
 		Short:            "A demo client for the GA4GH RNAget API",
 		Long:             `A demo client for the GA4GH RNAget API`,
+		Version:          version.Get(),
 		PersistentPreRun: getConfig,
 		SilenceUsage:     true,
 		SilenceErrors:    true,

pkg/version/version.go

@@ -0,0 +1,21 @@
+package version
+
+import (
+	"fmt"
+	"time"
+)
+
+var (
+	version = "dev"
+	date    = ""
+	commit  = ""
+)
+
+func Get() string {
+	parsedDate, err := time.Parse(time.RFC3339, date)
+	if err != nil {
+		panic(err)
+	}
+	formattedDate := parsedDate.Format(time.RFC1123)
+	return fmt.Sprintf("%s\n= Git commit: \t%s\n= Built: \t%s", version, commit, formattedDate)
+}