Implement login resolver (#15)

* add sign_up_method to users table

* add session store

* implement login resolver

server/utils/cookie.go

@@ -0,0 +1,17 @@
+package utils
+
+import (
+	"github.com/gin-gonic/gin"
+	"github.com/yauthdev/yauth/server/constants"
+)
+
+func SetCookie(gc *gin.Context, token string) {
+	secure := true
+	httpOnly := true
+
+	if !constants.IS_PROD {
+		secure = false
+	}
+
+	gc.SetCookie(constants.COOKIE_NAME, token, 3600, "/", GetFrontendHost(), secure, httpOnly)
+}