Jut setting all up for the calculator

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.20)
+project(calculator VERSION 1.0 LANGUAGES C)
+
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_C_STANDARD_REQUIRED ON)
+
+# Export compile_commands.json (para clangd)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_compile_options(
+    -Wall
+    -Wextra
+    -Wpedantic
+)
+
+
+include_directories(include)
+
+add_library(calculator_lib
+    src/lexer.c
+    src/parser.c
+    src/ast.c
+    src/evaluator.c
+)
+
+add_executable(calculator src/main.c)
+
+target_link_libraries(calculator calculator_lib)
+
+# ------------------------
+# Testing
+# ------------------------
+
+enable_testing()
+add_subdirectory(test)
+