My personal gitignore file for Unity3D
[Ll]ibrary/
[Tt]emp/
[Oo]bj/
[Bb]uild/
[Bb]uilds/
Assets/AssetStoreTools*
# Visual Studio cache directory
.vs/
# Autogenerated VS/MD/Consulo solution and project files
ExportedObj/
.consulo/
*.csproj
*.unityproj
*.sln
*.suo
*.tmp
*.user
*.userprefs
*.pidb
*.booproj
*.svd
*.pdb
*.opendb
# Unity3D generated meta files
*.pidb.meta
*.pdb.meta
# Unity3D Generated File On Crash Reports
sysinfo.txt
# Builds
*.apk
*.unitypackage
Based on https://github.com/github/gitignore