CMake support for building the demo added.

CMakeLists.txt

@@ -2,6 +2,7 @@ cmake_minimum_required(VERSION 3.8)
 project(indica VERSION 1.0.0 LANGUAGES CXX)
 option(INDICA_BUILD_TESTS OFF)
 option(SAMPLES "Build Samples" OFF)
+option(DEMO "Build Demo" OFF)
 
 include(CMakePackageConfigHelpers)
 include(GNUInstallDirs)
@@ -18,6 +19,10 @@ target_include_directories(indica INTERFACE
 target_link_libraries(indica INTERFACE Threads::Threads)
 
 
+if( DEMO )
+    add_subdirectory(demo)
+endif()
+
 if( SAMPLES )
     add_subdirectory(samples)
 endif()

demo/CMakeLists.txt

@@ -0,0 +1,2 @@
+add_executable(demo demo.cpp)
+target_link_libraries(demo PRIVATE indica::indica)