add ascii theme from #203

Author: schollz

examples/theme-ascii/main.go

@@ -0,0 +1,22 @@
+package main
+
+import (
+	"time"
+
+	"github.com/schollz/progressbar/v3"
+)
+
+func main() {
+	bar := progressbar.NewOptions(100,
+		progressbar.OptionUseANSICodes(false),
+		progressbar.OptionEnableColorCodes(true),
+		progressbar.OptionShowIts(),
+		progressbar.OptionSetTheme(progressbar.ThemeASCII),
+		progressbar.OptionShowElapsedTimeOnFinish(),
+	)
+
+	for i := 0; i < 100; i++ {
+		bar.Add(1)
+		time.Sleep(40 * time.Millisecond)
+	}
+}