add package gsession; mv gkvdb to new repo

.example/database/gkvdb/badger/main.go

@@ -1,18 +0,0 @@
-package main
-
-import (
-	"log"
-
-	"github.com/dgraph-io/badger"
-)
-
-func main() {
-	// Open the Badger database located in the /tmp/badger directory.
-	// It will be created if it doesn't exist.
-	db, err := badger.Open(badger.DefaultOptions("/tmp/badger"))
-	if err != nil {
-		log.Fatal(err)
-	}
-	defer db.Close()
-	// Your code here…
-}

.example/database/gkvdb/main1.go

@@ -1,19 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"time"
-
-	"github.com/gogf/gf/database/gkvdb"
-)
-
-func main() {
-	key := []byte("key")
-	value := []byte("value")
-
-	db := gkvdb.Instance()
-	db.SetPath("/tmp/gkvdb/test")
-	db.Set(key, value)
-	fmt.Println(db.Get(key))
-	time.Sleep(time.Hour)
-}