add tool.

CMakeLists.txt

@@ -1,7 +1,21 @@
 cmake_minimum_required(VERSION 3.17)
 
 project(Bilby)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+find_package(Boost REQUIRED COMPONENTS json program_options)
 
 add_executable(Bilby
     main.cpp
+)
+
+add_executable(shifter
+    SubtitleShifter.cpp
+)
+
+target_link_libraries(shifter
+    PRIVATE Boost::program_options
 )