Update io.github.archisman_panigrahi.wombat.metainfo.xml

Author: archisman-panigrahi

data/io.github.archisman_panigrahi.wombat.metainfo.xml

@@ -2,7 +2,7 @@
 <component type="desktop-application">
   <id>io.github.archisman_panigrahi.wombat</id>
   <name>Wombat</name>
-  <summary>High-precision scientific calculator with full unit support, powered by Numbat</summary>
+  <summary>Unit aware scientific calculator</summary>
   <metadata_license>CC0-1.0</metadata_license>
   <project_license>GPL-3.0-or-later</project_license>
 
@@ -60,6 +60,11 @@
     </release>
   </releases>
 
+  <branding>
+    <color type="primary" scheme_preference="light">#f6d2d2</color>
+    <color type="primary" scheme_preference="dark">#77767b</color>
+  </branding>
+
   <screenshots>
     <screenshot type="default">
       <image>https://raw.githubusercontent.com/archisman-panigrahi/wombat/63b5e2d93a1f790e2883ce2a93a53525770071ae/data/screenshots/wombat.png</image>