Implemented the initial Go framework

internal/cli/root.go

@@ -0,0 +1,18 @@
+package cli
+
+import (
+	"github.com/spf13/cobra"
+)
+
+// NewRootCommand builds the seriatim command tree.
+func NewRootCommand() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:           "seriatim",
+		Short:         "Merge per-speaker transcripts into a chronological transcript",
+		SilenceErrors: true,
+		SilenceUsage:  true,
+	}
+
+	cmd.AddCommand(newMergeCommand())
+	return cmd
+}