add titan example

examples/titan/file.txt

@@ -0,0 +1,7 @@
+ ▄▄▄▄▄▄▄▄   ▄▄▄▄▄▄   ▄▄▄▄▄▄▄▄     ▄▄     ▄▄▄   ▄▄ 
+ ▀▀▀██▀▀▀   ▀▀██▀▀   ▀▀▀██▀▀▀    ████    ███   ██ 
+    ██        ██        ██       ████    ██▀█  ██ 
+    ██        ██        ██      ██  ██   ██ ██ ██ 
+    ██        ██        ██      ██████   ██  █▄██ 
+    ██      ▄▄██▄▄      ██     ▄██  ██▄  ██   ███ 
+    ▀▀      ▀▀▀▀▀▀      ▀▀     ▀▀    ▀▀  ▀▀   ▀▀▀ 

examples/titan/main.go

@@ -0,0 +1,32 @@
+package main
+
+import (
+	"os"
+
+	"github.com/pitr/gig"
+)
+
+func main() {
+	g := gig.Default()
+	g.AllowProxying = true
+	g.Use(gig.Titan(1024))
+
+	g.Handle("/file.txt*", func(c gig.Context) error {
+		if c.Get("titan").(bool) {
+			data, err := gig.TitanReadFull(c)
+			if err != nil {
+				return err
+			}
+
+			err = os.WriteFile("file.txt", data, 0644)
+			if err != nil {
+				return err
+			}
+			gig.TitanRedirect(c)
+			return nil
+		}
+		return c.File("file.txt")
+	})
+
+	g.Run("../astro.crt", "../astro.key")
+}