Initial data commit

Task/Bitmap-Histogram/Ada/bitmap-histogram-2.ada

@@ -0,0 +1,17 @@
+function Median (H : Histogram) return Luminance is
+   From  : Luminance   := Luminance'First;
+   To    : Luminance   := Luminance'Last;
+   Left  : Pixel_Count := H (From);
+   Right : Pixel_Count := H (To);
+begin
+   while From /= To loop
+      if Left < Right then
+         From := From + 1;
+         Left := Left + H (From);
+      else
+         To    := To    - 1;
+         Right := Right + H (To);
+      end if;
+   end loop;
+   return From;
+end Median;