Add database driver and config module

Signed-off-by: Asai Neko <sugar@sne.moe>

main.go

@@ -1,11 +1,13 @@
 package main
 
 import (
+	"nixcn-cms/config"
 	"nixcn-cms/logger"
 	"nixcn-cms/server"
 )
 
 func main() {
+	config.Init()
 	logger.Init()
-	server.Start(":8000")
+	server.Start()
 }