[gimp-web] 2.99.4: add the skeleton of the news announcement

[Alexandre Prokoudine <aprokoudine src gnome org>]

commit 0720264a6b528d02086afa98865ee3052d8415ba
Author: Alexandre Prokoudine <alexandre prokoudine gmail com>
Date:   Thu Dec 17 00:52:06 2020 +0300

    2.99.4: add the skeleton of the news announcement

 .../2020/2020-12_GIMP-2.99.4_Released/index.md     | 66 ++++++++++++++++++++++
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+Title: Development release GIMP 2.99.4 is out
+Date: 2020-12-20
+Category: News
+Authors: Wilber
+Slug: gimp-2-99-4-released
+Summary: GIMP 2.99.4 is out with bug fixes and usability improvements
+
+As we are progressing towards v3.0, we expect future unstable releases
+to have less new features and more bug fixes and improvements.
+
+Release highlights:
+
+- Usability fixes across various parts of GIMP
+- New Paint Select tool in the playground
+- New generic metadata support API for saving
+- Multi-threaded JPEG2000 decoding
+- Initial documentation on porting plug-ins to 3.0
+
+<figure>
+<img src="{attach}gimp-splash-2.99.2.jpg" alt="GIMP 2.99.2 splash screen by Aryeom, CC by-sa"/>
+<figcaption>
+<em>GIMP 2.99.2 splash screen by <a href="https://film.zemarmot.net";>Aryeom</a>, Creative Commons by-sa 
4.0</em>
+</figcaption>
+</figure>
+
+# Usability fixes
+## Slider widget
+
+FIXME
+
+## Multi-layer selection
+
+FIXME
+
+## Input Devices dialog
+
+FIXME
+
+# New experimental Paint Select tool
+
+FIXME
+
+# New generic metadata support API for saving
+
+FIXME
+
+# Updated file plug-ins
+
+FIXME
+
+# Dev docs on porting plug-ins to 3.0
+
+FIXME
+
+# GEGL and babl
+
+FIXME
+
+# What's next
+
+FIXME
+
+You can [donate to the project and personally fund several GIMP
+developers](https://www.gimp.org/donating/) who make this all possible
+at all. This is also a way to give back and accelerate the development
+of GIMP if you appreciate the project.