Add README

Author: claudio4

README.md

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+# cloudflare-ddns
+## Unoffical Cloudflare DDNS Client.
+
+### Features  
+:white_check_mark: Pv4 & IPv6 support  
+:white_check_mark: Daemon mode  
+:white_check_mark: Cloudflare API Token auth supported  
+:white_check_mark: Cloudflare API KEY auth supported  
+:white_check_mark: 0 external dependencies  
+:white_check_mark: Pretty logger  
+:white_check_mark: JSON logger
+
+### Downloads
+Binaries for all platforms can be found on the [releases page](https://github.com/claudio4/cloudflare-ddns/releases).
+
+### Usage example
+[![asciicast](https://asciinema.org/a/ek8WqVSKqGWuUaFUxNMX7dSv6.svg)](https://asciinema.org/a/ek8WqVSKqGWuUaFUxNMX7dSv6)