invite users

hugo/content/ref/fit/data-import/tiff.md

@@ -38,3 +38,7 @@ $ identify -verbose file.tiff
 In Windows [AsTiffTagViewer](https://www.awaresystems.be/imaging/tiff/astifftagviewer.html) can be used.
 
 Alternatively, online services can show metadata tags.
+
+### Unsupported tiff formats
+
+If there is a case of `tiff` data file that is not yet supported, please contact us and provide the example.