Created How to use lexicon dns api (markdown)

How-to-use-lexicon-dns-api.md

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+## lexicon is a python tool for a number dns providers.
+
+As I'm writing this doc, it supports the following dns api:
+The current supported providers are:
+
+* Cloudflare
+* DigitalOcean
+* DNSimple
+* DnsMadeEasy
+* DNSPark
+* EasyDNS
+* Namesilo
+* NS1
+* PointHQ
+* Rage4
+* Vultr
+
+
+You can check its project page: https://github.com/AnalogJ/lexicon
+
+You must install `python` and `lexicon` before using it.
+
+## Examples:
+### 1. Using lexicon cloudflare api:
+```
+export LEXICON_CLOUDFLARE_USERNAME="xxxx@xxx.com"
+export LEXICON_CLOUDFLARE_TOKEN="XXXXXXXXXXXXXXX"
+
+acme.sh --issue  -d test.acme.sh  --dns  dns_lexicon
+```
+
+
+For more examples, please check lexicon page: https://github.com/AnalogJ/lexicon
+
+
+