Add new exception to be thrown when parsing CSV files fails

exceptions/generic/MDInvalidCsv.php

@@ -0,0 +1,19 @@
+<?PHP
+declare(strict_types = 1);
+
+/**
+ * Exception to be thrown if parsing a CSV file is impossible (usually errors in
+ * trying to get table headings).
+ */
+final class MDInvalidCsv extends Exception {
+    /**
+     * Error message.
+     *
+     * @return string
+     */
+    public function errorMessage() {
+        //error message
+        return 'Invalid input CSV: ' . $e->getMessage();
+
+    }
+}