Create readme

Readme.txt

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+## Db Query for opml
+
+SELECT
+    '<outline type="rss" '
+        || 'text="' || name || '" '
+        || 'title="' || name || '" '
+        || 'xmlUrl="https://www.youtube.com/feeds/videos.xml?channel_id=' || substr(url, instr(url, 'UC')) || '" '
+        || 'htmlUrl="' || url || '" '
+        || 'language="fr" '
+        || 'image="' || avatar_url || '"'
+        || ' />' AS outline_xml
+FROM main.subscriptions
+where url like '%youtube%'
+ORDER BY service_id, name;