add chapter 15.7 (#683)

eBook/examples/chapter_15/pipeline1.go

@@ -0,0 +1,18 @@
+// pipeline1.go
+package main
+
+import (
+	"os"
+	"text/template"
+)
+
+func main() {
+	t := template.New("template test")
+	t = template.Must(t.Parse("This is just static text. \n{{\"This is pipeline data - because it is evaluated within the double braces.\"}} {{`So is this, but within reverse quotes.`}}\n"))
+	t.Execute(os.Stdout, nil)
+}
+
+/*
+This is just static text.
+This is pipeline data - because it is evaluated within the double braces. So is this, but within reverse quotes.
+*/