added basic cmake interface

Author: AdhocMan

CMakeLists.txt

@@ -0,0 +1,10 @@
+cmake_minimum_required(VERSION 3.1.3 FATAL_ERROR)
+project(gtest_mpi CXX)
+
+add_library(gtest_mpi INTERFACE)
+
+target_include_directories(gtest_mpi INTERFACE include)
+
+if(NOT (${CMAKE_VERSION} VERSION_LESS "3.8.2"))
+  target_compile_features(gtest_mpi INTERFACE cxx_std_11)
+endif()