Ignore the project files from IDE or editors I sometimes browse and edit C/C++ code with VSCode, and it would generate some project files in .vscode which could easily be added and even pushed to a git repo by accident. It's sort of annoying for programmers who work with VS/VSCode, IntelliJ/Clion, or other widely-used IDE or editors to prevent themself from using git command like `git add .` in lib event project. Therefore, I propose leaving the project files generated by VS/VSCode and IntelliJ/Clion untracked for libevent project. Hopefully, this can be accepted.