Added CC0 link to the documentation README.

README.md

@@ -21,3 +21,20 @@ LaTex and other formats. For more information on Markdown, see [this guide](Help
 
 * [Git and Gitlab](Help/Git-and-Gitlab.md)
 * [Markdown](Help/Markdown.md)
+
+<p xmlns:dct="http://purl.org/dc/terms/" xmlns:vcard="http://www.w3.org/2001/vcard-rdf/3.0#" align="center">
+  <a rel="license"
+     href="http://creativecommons.org/publicdomain/zero/1.0/">
+    <img src="http://i.creativecommons.org/p/zero/1.0/88x31.png" style="border-style: none;" alt="CC0" />
+  </a>
+  <br />
+  To the extent possible under law,
+  <span resource="[_:publisher]" rel="dct:publisher">
+    <span property="dct:title">SNAC Cooperative</span></span>
+  has waived all copyright and related or neighboring rights to
+  <span property="dct:title">SNAC Documentation</span>.
+This work is published from:
+<span property="vcard:Country" datatype="dct:ISO3166"
+      content="US" about="[_:publisher]">
+  United States</span>.
+</p>
\ No newline at end of file