add example for memory storage og gsession

.example/os/gsession/storage-memory/memory.go

@@ -0,0 +1,30 @@
+package main
+
+import (
+	"github.com/gogf/gf/frame/g"
+	"github.com/gogf/gf/net/ghttp"
+	"github.com/gogf/gf/os/gsession"
+	"github.com/gogf/gf/os/gtime"
+	"time"
+)
+
+func main() {
+	s := g.Server()
+	s.SetConfigWithMap(g.Map{
+		"SessionMaxAge":  time.Minute,
+		"SessionStorage": gsession.NewStorageMemory(),
+	})
+	s.BindHandler("/set", func(r *ghttp.Request) {
+		r.Session.Set("time", gtime.Second())
+		r.Response.Write("ok")
+	})
+	s.BindHandler("/get", func(r *ghttp.Request) {
+		r.Response.Write(r.Session.Map())
+	})
+	s.BindHandler("/del", func(r *ghttp.Request) {
+		r.Session.Clear()
+		r.Response.Write("ok")
+	})
+	s.SetPort(8199)
+	s.Run()
+}

.example/os/gsession/storage-redis-hashtable/redis-hashtable.go

@@ -11,7 +11,7 @@ import (
 func main() {
 	s := g.Server()
 	s.SetConfigWithMap(g.Map{
-		"SessionMaxAge":  60 * time.Minute,
+		"SessionMaxAge":  time.Minute,
 		"SessionStorage": gsession.NewStorageRedisHashTable(g.Redis()),
 	})
 	s.BindHandler("/set", func(r *ghttp.Request) {