Mention client libraries in API documentation

Resolves #214

Change-Id: I1719bb6ce18c9667301e0c8a1a35306cf9c2addf
diff --git a/templates/doc/api.html.ep b/templates/doc/api.html.ep
index 3836981..411a876 100644
--- a/templates/doc/api.html.ep
+++ b/templates/doc/api.html.ep
@@ -20,3 +20,10 @@
 % } 
 
 <p>The root service can be found at <code id="api-service-uri"><%=  $api_url %></code>.</p>
+
+<h2>Client Libraries</h2>
+
+<p>Client libraries are available for R on <%= ext_link_to 'CRAN', 'https://cran.r-project.org/package=RKorAPClient' %>
+(sources and more info on <%= ext_link_to 'GitHub', 'https://github.com/KorAP/RKorAPClient' %>)
+and for Python on <%= ext_link_to 'PyPI', 'https://pypi.org/project/KorAPClient/' %>
+(sources on <%= ext_link_to 'GitHub', 'https://github.com/KorAP/PythonKorAPClient' %>).</p>