Add cspice cmake file

# CMake module for find_package(CSPICE)

# Finds include directory and all applicable libraries

#

# Sets the following:

#   CSPICE_INCLUDE_DIR

#   CSPICE_LIBRARY

find_path(CSPICE_INCLUDE_DIR

  NAME SpiceUsr.h

  PATH_SUFFIXES naif cspice

)

find_library(CSPICE_LIBRARY

  NAMES cspice

)

message(STATUS "CSPICE INCLUDE: " ${CSPICE_INCLUDE_DIR} )

message(STATUS "CSPICE LIB: "  ${CSPICE_LIBRARY} )

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