Added AltitudeUnderWater class to project file.
Added AltitudeUnderWater class to project file.

--- a/KerbalEngineer/KerbalEngineer.csproj
+++ b/KerbalEngineer/KerbalEngineer.csproj
@@ -97,6 +97,7 @@
     <Compile Include="Flight\Readouts\Rendezvous\SemiMajorAxis.cs" />
     <Compile Include="Flight\Readouts\Rendezvous\TimeToRelativeDescendingNode.cs" />
     <Compile Include="Flight\Readouts\Rendezvous\TimeToRelativeAscendingNode.cs" />
+    <Compile Include="Flight\Readouts\Surface\AltitudeUnderWater.cs" />
     <Compile Include="Flight\Readouts\Surface\ImpactBiome.cs" />
     <Compile Include="Flight\Readouts\Surface\Slope.cs" />
     <Compile Include="Flight\Readouts\Surface\Biome.cs" />