Add sample gitignore, update CMakeLists.txt

Signed-off-by: Daniel Henry <iamdanhenry@gmail.com>

CMakeLists.txt

@@ -11,7 +11,12 @@ set(CMAKE_CXX_STANDARD_REQUIRED     ON)
 set(CMAKE_CXX_EXTENSIONS            OFF)
 set(CMAKE_EXPORT_COMPILE_COMMANDS   ON)
 
-
-
 # Main executable 
 add_executable(${PROJECT_NAME} src/main.cpp)
+
+target_include_directories(${PROJECT_NAME}
+  PUBLIC include/
+)
+
+# target_sources(${PROJECT_NAME} PRIVATE src/sample.cpp)
+