Add Knowledge library info

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         <p style="font-size: small;">
             The DSS API and the Weather API are based on software developed for a similar purpose in Europe in the <a href="https://platform.ipmdecisions.net/" target="new">IPM Decisions project</a>
         </p>
+        <h3>Knowledge library API AKA Data catalogue</h3>
+        <p>We are implementing the knowledge library using a data catalogue, more specifically CKAN software. It is located at <a href="https://ckan.madiphs.org/" target="new">ckan.madiphs.org</a></p>
+        <h4>Test datasets</h4>
+        Some test datasets have been placed on this server, you can start browsing <a href="datasets/" target="new"></a>here</a>.
+        <ul>
+            <li><a href="datasets/copernicus22/">Weather data from Copernicus Jan 22 -&gt; May 23</a></li>
+        </ul>
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