cloudflare-ddns: added entry for ddns for cloudflare

wiki/cloudflare-ddns.md

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+# Cloudflare DDNS
+
+If you have a dynamic IP address, you will need to update your domain on cloudflare
+regularly to ensure you're mapping onto the right address.
+This service will do that for you.
+
+## Docker
+
+The official container and documentation was made by [oznu](https://github.com/oznu/docker-cloudflare-ddns).
+
+### Environment variables
+
+Set the following variables with the -e tag.
+
+| Variable name | Description                                            |
+| ------------- | ------------------------------------------------------ |
+| `API_KEY=`    | append your API key that you retrieved from cloudflare |
+| `ZONE=`       | append your domain (for example `main.com`)            |
+| `SUBDOMAIN`   | append your subdomain (for example `dynamic`)          |
+
+### Rebuild
+
+```shell
+#!/bin/sh
+docker stop ddns
+docker rm ddns
+docker pull oznu/cloudflare-ddns
+docker run \
+    --name ddns \
+    -e API_KEY=1234567890 \
+    -e ZONE=main.com \
+    -e SUBDOMAIN=dynamic \
+    -d oznu/cloudflare-ddns
+```