Add CMakeLists.txt and gitignore

.gitignore

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+### C ###
+# Prerequisites
+*.d
+
+# Object files
+*.o
+*.ko
+*.obj
+*.elf
+
+# Linker output
+*.ilk
+*.map
+*.exp
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Libraries
+*.lib
+*.a
+*.la
+*.lo
+
+# Shared objects (inc. Windows DLLs)
+*.dll
+*.so
+*.so.*
+*.dylib
+
+# Executables
+*.exe
+*.out
+*.app
+*.i*86
+*.x86_64
+*.hex
+
+# Debug files
+*.dSYM/
+*.su
+*.idb
+*.pdb
+
+# Kernel Module Compile Results
+*.mod*
+*.cmd
+.tmp_versions/
+modules.order
+Module.symvers
+Mkfile.old
+dkms.conf
+
+### CMake ###
+CMakeLists.txt.user
+CMakeCache.txt
+CMakeFiles
+CMakeScripts
+Testing
+Makefile
+cmake_install.cmake
+install_manifest.txt
+compile_commands.json
+CTestTestfile.cmake
+_deps
+
+### CMake Patch ###
+# External projects
+*-prefix/

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.20)
+set(CMAKE_C_STANDARD 17)
+set(CMAKE_C_STANDARD_REQUIRED True)
+
+project(Tetris)
+
+add_executable(Tetris src/tetris.c src/gl.c)
+
+find_package(glfw3 3.3 REQUIRED)
+target_link_libraries(Tetris glfw)
+
+find_package(OpenGL REQUIRED)
+target_link_libraries(Tetris OpenGL::GL)
+
+target_include_directories(Tetris PUBLIC
+                           include/
+                           )
+