The introduction of TRANSLATION.md for Crowdin is a bit too simple to understand, especially for a newbie who wants to join in the group and how to get started. Here I've given some very useful links to guide them step-by-step on how to cope with Crowdin and join in the translating group together to make contributions to nodejs.org.

Several changes:

1. Rename 'Crowdin' to 'Nodejs-website in Crowin', because this is a nodejs-website based Crowdin project.

2. Add more step-by-step guides to bring you to the home of Crowdin and join in it without problems to get started quickly.

Signed-off-by: Wai.Tung <maledong_public@foxmail.com>

fix according to @Trott 's review

Signed-off-by: Wai.Tung <maledong_public@foxmail.com>

Oh, many thanks! This is more suitable.

Co-authored-by: Claudio Wunder <cwunder@gnome.org>
Signed-off-by: Wai.Tung <maledong_public@foxmail.com>