Update README

README.md

@@ -1,2 +1,34 @@
 # win-acme-dns-ovh
-Scripts for Win-Acme to allow DNS validation on OVH.
+Scripts for [win-acme](https://www.win-acme.com) to allow DNS validation on OVH.
+
+# Instructions
+
+First of all, obtain credentials from OVH: https://github.com/ovh/node-ovh#login-as-a-user
+
+Then, copy `.env.example`, rename the copy to just `.env` and fill in the values, like in this:
+
+```sh
+# example values, get yours from OVH
+OVH_ENDPOINT=ovh-eu
+OVH_APP_KEY=383w8gb8DkVjP36L
+OVH_APP_SECRET=bNDbrEg6z6w672EZjoKJvzninym37234
+OVH_CUSTOMER_KEY=d7vA2PsGef6vkVvf7y4HfzYb987e32Mx
+```
+
+Now you can setup win-acme to use these scripts for DNS-01 challenge. Here is a rough step-by-step walkthrough of the prompts from win-acme:
+1. Create certificate (full options)
+1. Manual input
+1. Common name: [your.domain]
+1. Friendly name: [Enter]
+1. Create verification records **with your own scripts**
+1. Path to script to create: `C:\Program Files\nodejs\node.exe` (should be your Node.js executable)
+1. Delete: Using the same script
+1. Create parameters: `C:\src\win-acme-dns-ovh\index.js create {Identifier} {RecordName} {Token}` (for index.js specify the directory of you local checkout)
+1. Delete parameters: `C:\src\win-acme-dns-ovh\index.js delete {Identifier} {RecordName} {Token}`
+1. CSR: default
+1. Certificate store: according to your needs
+1. Path for .pem files (in case you chose PEM encoded files above): something like `C:\etc\letsencrypt\your.domain` should be fine
+1. Additional store: according to your needs
+1. Installation step: according to your needs
+
+[win-acme](https://www.win-acme.com) will take care of creating the scheduled task to automatically renew the certificate.