Created notify (markdown)

notify.md

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+# Set notification
+
+
+```sh
+acme.sh --set-notify  [--notify-hook mailgun]
+
+acme.sh --set-notify  [--notify-level 2]
+acme.sh --set-notify  [--notify-mode 0]
+```
+
+
+## 1. Set notification for mailgun.com
+
+```sh
+export  MAILGUN_API_KEY="xxxxxxxx"
+export  MAILGUN_APIDOMAIN="xxxxxx.com" 
+export  MAILGUN_FROM="xxx@xxxxx.com"
+export  MAILGUN_TO="yyyy@gmail.com"
+
+
+export  MAILGUN_REGION="us|eu"          #optional, use "us" as default
+
+acme.sh --set-notify  --notify-hook mailgun
+```
+
+
+## 2. Set notification for sendgrid.com
+
+```sh
+export SENDGRID_API_KEY="xxxxxxxxxx"
+export SENDGRID_FROM="xxxx@cccc.com"
+export SENDGRID_TO="xxxx@xxx.com"
+
+acme.sh --set-notify  --notify-hook sendgrid
+```
+
+