add news for 2025-04-19

The **IOCCC28** **OPEN** period has reached the half-way point.
This is a _gentle suggestion_ to not wait until the last minute to write, test
and upload your submission.

The **IOCCC28** is [open for registration](https://www.ioccc.org/next/register.html).
Those who have registered have until **2025-06-05 04:03:02.010099 UTC** to
[upload their submissions](https://www.ioccc.org/next/submit.html).

See "[how enter the IOCCC](https://www.ioccc.org/quick-start.html#enter)" for more information.

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