Hope add some suggestions for Chinese users

In China, we are so slowly download node-js and its packages by using nodejs offical website.

But unlucky Chinese university like tsinghua and big company like taobao.inc can provide us its mirror website.

I hope you can add my suggestions in readme.md and node-red webiste:

For debian/raspbian:

If you are Chinese user, we suggest you to change your node-js offical mirror to Chinese mirror, 如果您在中国请使用国内镜像源获取更好的下载体验，

run curl -sL https://deb.nodesource.com/setup_12.x | sudo bash - , 示例：curl -sL https://deb.nodesource.com/setup_12.x | sudo bash - 从官方安装apt源，

then please edit apt source list/etc/apt/sources.list.d/nodesource.list like this: 编辑镜像源/etc/apt/sources.list.d/nodesource.list 修改如下：

#deb https://deb.nodesource.com/node_12.x buster main
#deb-src https://deb.nodesource.com/node_12.x buster main
deb https://mirrors.tuna.tsinghua.edu.cn/nodesource/deb_12.x buster main
deb-src https://mirrors.tuna.tsinghua.edu.cn/nodesource/deb_12.x buster main

if you edit it. Please runsudo apt-get update. 更改镜像源后应该刷新缓存，请运行`sudo apt-get update``

also,you can change npm sourcenpm config set registry https://registry.npm.taobao.org 同样，建议修改npm安装源为淘宝镜像源npm config set registry https://registry.npm.taobao.org

For CentOS:

If you are Chinese user, we suggest you to change your node-js offical mirror to Chinese mirror, 如果您在中国请使用国内镜像源获取更好的下载体验，

visit https://mirrors.tuna.tsinghua.edu.cn/nodesource/ and see which version do you need, you can add its yum source list like this rpm -ivh https://mirrors.tuna.tsinghua.edu.cn/nodesource/rpm_10.x/el/7/x86_64/nodesource-release-el7-1.noarch.rpm 请找到适合您的rpm源安装包

then edit yum source list /etc/yum.repos.d/nodesource-el7.repo like this: 然后编辑nodesource源如下（请根据实际情况修改）：

[nodesource]
name=Node.js Packages for Enterprise Linux 7 - $basearch
baseurl=https://mirrors.tuna.tsinghua.edu.cn/nodesource/rpm_10.x/el/7/$basearch
failovermethod=priority
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/NODESOURCE-GPG-SIGNING-KEY-EL

[nodesource-source]
name=Node.js for Enterprise Linux 7 - $basearch - Source
baseurl=https://mirrors.tuna.tsinghua.edu.cn/nodesource/rpm_10.x/el/7/SRPMS
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/NODESOURCE-GPG-SIGNING-KEY-EL
gpgcheck=1

please make cache again by runing sudo yum makecache 更改镜像源后请刷新缓存。

also,you can change npm sourcenpm config set registry https://registry.npm.taobao.org 同样，建议修改npm安装源为淘宝镜像源npm config set registry https://registry.npm.taobao.org

refer: 1.Nodesource 镜像使用帮助 2.淘宝 NPM 镜像 3.https://github.com/nodesource/distributions

Thank you!

node-red / linux-installers

Hope add some suggestions for Chinese users #5

For debian/raspbian:

For CentOS: