Add .gitignore file

Ignore usual C++ and IDE files/folders

.gitignore

+.DS_Store
+.idea
+*.log
+tmp/
+*.ninja*
+CMakeFiles
+/bin
+CMakeCache.txt
+cmake_install.cmake
+CMakeLists.txt.user
+CMakeUserPresets.json
+*.a
+*.depends
+.cmake
+*.so
+CMakeDoxygenDefaults.cmake
+CMakeDoxyfile.in
+/build*/
+specs/
+Makefile
+appdir/
+generated/
+install_manifest.txt
+Temporary/
+*pyc
+Scripts/
+CTestCustom.cmake
+Doxyfile.macsima_docs
+*failedImages*
+/.vscode
+/.cache
+/compile_commands.json
+error_*.png