Add sunshine to the FAQ for calibre not starting on windows

manual/faq.rst

@@ -811,6 +811,10 @@ There can be several causes for this:
       probably just appeared off screen. You can gather all windows onto the
       current screen using one of the techniques described `here <https://www.wikihow.com/Bring-an-Off-Screen-Window-Back-on-Windows>`__.
 
+    * Some software has been known to interfere with calibre, try rebooting in
+      Safe mode and see if it works. A known culprit is the `sunshine
+      <https://github.com/LizardByte/Sunshine>`__ screen sharing software.
+
     * If you get an error about calibre not being able to open a file because it is in use by another program, do the following:
 
        * Uninstall calibre