Update README.md

Author: solidnerd

README.md

@@ -1,6 +1,26 @@
 Let's Encrypt DNS Challenge
 ===========================
 
+## Why ?
+
+# New Image / Container
+Generally you start your letsencrpyt container and make an authentication challenge over http. 
+
+The problem here is that the http authentication requires both standard ports from http (80/tcp) and https(443/tcp).
+
+I couldn't managet it to use other ports for the http challenge. So in that case it requires to temporarily shutdown your loadbalancer to receive a new certificate.
+
+Later I read on and I found out that the [ACME Spec](https://letsencrypt.github.io/acme-spec/) supports more than http authentication challenge.
+
+So I found the interessting point. That I can resolve my authentication over dns.
+
+Futhermore I wan't to be able to do in future and I don't want to handle all dependencies again, so I wrote this container.
+
+### Cloudflare
+
+Cloudflare helps to automatically generate dns entries in this case TXT Records to supoort the [DNS Authentication](https://letsencrypt.github.io/acme-spec/#dns), 
+because they provide an API for managing her DNS Server.
+
 This repo contains only an image for an letsencrpyt container to use dns challenge with cloudflare.
 
 It uses the certbot image directly.
@@ -41,9 +61,12 @@ solidnerd/letsencrpyt-dns:0.1.0
 | CLOUDFLARE_EMAIL | Email Address that is used to login in cloudflare |
 | CERTBOT_IP_LOGGING | Accepts that the IP will be logged from the server that requests a certificate | 
 
-## Issues
+## Issues or Improvements
+
+If you have an issue make an issue on the [GitHub Repo](https://github.com/solidnerd/letsencrypt-dns).
+
+If have any cool ideas for the repo let me know as well [GitHub Repo](https://github.com/solidnerd/letsencrypt-dns).
 
-Make an issue on the [GitHub Repo](https://github.com/solidnerd/letsencrypt-dns) .
 
 ## Inspiration