Add instructions for custom ogre location.
Add instructions for custom ogre location.

AlphaStaxLLC/tundra,jesterKing/naali,AlphaStaxLLC/tundra,BogusCurry/tundra,jesterKing/naali,realXtend/tundra,pharos3d/tundra,realXtend/tundra,realXtend/tundra,jesterKing/naali,AlphaStaxLLC/tundra,BogusCurry/tundra,jesterKing/naali,AlphaStaxLLC/tundra,pharos3d/tundra,pharos3d/tundra,pharos3d/tundra,jesterKing/naali,AlphaStaxLLC/tundra,pharos3d/tundra,BogusCurry/tundra,BogusCurry/tundra,realXtend/tundra,AlphaStaxLLC/tundra,realXtend/tundra,BogusCurry/tundra,jesterKing/naali,BogusCurry/tundra,realXtend/tundra,pharos3d/tundra,jesterKing/naali