Add generic exception MDParseException

exceptions/generic/MDParseException.php

@@ -0,0 +1,18 @@
+<?PHP
+declare(strict_types = 1);
+
+/**
+ * Custom exception class to be thrown when import data could not be parsed.
+ */
+final class MDParseException extends MDExpectedException {
+    /**
+     * Error message.
+     *
+     * @return string
+     */
+    public function errorMessage() {
+        //error message
+        return 'Failed to parse input: ' . $this->getMessage();
+
+    }
+}