[gimp-web/testing] news: add HGT format support information.

[Jehan Pagès <jehanp src gnome org>]

commit c9a456139c8d08f6c3825929c73af935b2187527
Author: Jehan <jehan girinstud io>
Date:   Sat Dec 9 23:29:10 2017 +0100

    news: add HGT format support information.

 .../news/2017-12-XX GIMP 2.9.8 Released/index.md   |   16 ++++++++++++++--
 content/news/images/gimp-2-9-8/GIMP-import-hgt.png |  Bin 0 -> 910496 bytes
 2 files changed, 14 insertions(+), 2 deletions(-)
---
diff --git a/content/news/2017-12-XX GIMP 2.9.8 Released/index.md b/content/news/2017-12-XX GIMP 2.9.8 
Released/index.md
index 0e51ac0..d63efef 100644
--- a/content/news/2017-12-XX GIMP 2.9.8 Released/index.md      
+++ b/content/news/2017-12-XX GIMP 2.9.8 Released/index.md      
@@ -124,8 +124,20 @@ more expected results now.
 
 ## File formats
 
-Various fixes were done to PSD format support. Moreover password-protected
-PDF files can now be imported in GIMP.
+* Various fixes were done to PSD format support.
+* Password-protected PDF files can now be imported in GIMP.
+* HGT files can now be imported. HGT format is the format for [Digital Elevation
+  Model data by the NASA](https://dds.cr.usgs.gov/srtm/version2_1/Documentation/SRTM_Topo.pdf).
+  GIMP now supports both the SRTM-1 and SRTM-3 types which will be imported as
+  grayscale RGB images, on which you will want to map a gradient in order to
+  obtain more visible relief information.
+
+<figure>
+<img src="{filename}images/gimp-2-9-8/GIMP-import-hgt.png" alt='Importing HGT files in GIMP' width='950' 
height='616'>
+<figcaption>
+NASA HGT file import followed by appropriate "Gradient Map" filtering
+</figcaption>
+</figure>
 
 ## Translations
 
diff --git a/content/news/images/gimp-2-9-8/GIMP-import-hgt.png 
b/content/news/images/gimp-2-9-8/GIMP-import-hgt.png
new file mode 100644
index 0000000..811c363
Binary files /dev/null and b/content/news/images/gimp-2-9-8/GIMP-import-hgt.png differ