added sitemap and docs

controllers/sitemap.php

@@ -0,0 +1,42 @@
+<?php
+header('Content-Type: text/xml');
+// https://www.sitemaps.org/protocol.html
+// Check it here: https://www.mysitemapgenerator.com/service/check.html
+
+$query=<<<EOSQL
+    SELECT draft, slug, updated, changefreq, priority, path
+        FROM pages
+        WHERE priority > 0
+            AND draft = 0
+        ORDER BY updated DESC;
+EOSQL;
+$thepages = $db->getRows($query);
+
+// Start the view
+echo '<?xml version="1.0" encoding="UTF-8"?>';
+echo '<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">';
+
+// Loop through the pages
+if ( ! empty($thepages) ) {
+    foreach( $thepages as $v) {
+
+        $date = (new \DateTime($v['updated']))->format('Y-m-d');
+
+    echo "<url>";
+
+    if ( empty($v['path']) )
+        echo "<loc>" . $config['base_url'] . '/page/' . $v['slug'] . "</loc>";
+    else
+        echo "<loc>" . $config['base_url'] . $v['path'] . "</loc>";
+
+    echo "<lastmod>" . $date . "</lastmod>";
+    echo "<changefreq>" . $v['changefreq'] . "</changefreq>";
+    echo "<priority>" . sprintf("%.1f", $v['priority']) . "</priority>";
+    echo "</url>";
+
+    }
+} else {
+    echo "no pages added yet";
+}
+
+echo "</urlset>";