Update README.md

Author: devboxid

README.md

@@ -14,3 +14,35 @@
 	         Digitalocean Certificate Letsencrypt Generator
 
 ```
+
+## Description
+**docert** is certbot helper script for generating letsencrypt using digitalocean plugin. It can be usefull for automation or manual creation. Personally we use this for generating ssl letsencrypt certificate on development.
+
+## How to use
+Using this script is quite simple, but required docker. We already used this on Mac or Linux.
+1. Clone this repository, then build your docker image.
+```
+cd docert
+docker build -t devboxid/docert:latest .
+```
+2. [Generate](https://www.digitalocean.com/docs/apis-clis/api/create-personal-access-token/) your digitalocean personal access token.
+3. Save in `./secrets/config.ini` same as your working/cloned repository.
+```
+## config.ini
+dns_digitalocean_token = deb15a2a06**************************************
+```
+4. If you change tag docker build in step-1. Don't forget to change docker tag in [docert.sh](./docert.sh#L3)
+5. Run it.
+```
+./docert.sh
+
++-----------------------------------+
+|  TASK    |   TASK USAGE FOR       |
++-----------------------------------+
+|   list   |   list certificate     |
+|   new    |   create certificate   |
+|   renew  |   renew certificate    |
++-----------------------------------+
+
+Type your task :
+```