Issues in generated ics file

[harish-aka-shivi]

I was implementing Add to Calendar button for a project, I figured out there are some issues in creating ics file.

• The content lines should be delimited by CRLF (link). So it should be appended by "\r\n" instead of "\n".
• PRODID property is required in ics file structure. (link)
• Similarly, DTSTAMP and UID are also required for the valid structure.

We can validate the ics file here.