Add icons about Microsoft and Google, Unreal Engine icons

[kyle-seongwoo-jun]

trafficstars

Name	File Name	Image
.NET	dotnet.svg
.NET Foundation	dotnet-foundation.svg
Google	google.svg
Microsoft	microsoft.svg
Windows	windows.svg
Visual Studio	visual-studio.svg
Visual Studio Code	visual-studio-code.svg
Visual Studio for Mac	visual-studio-for-mac.svg
TypeScript	typescript.svg
Unreal Engine	unrealengine.svg
Xamarin	xamarin.svg

[kyle-seongwoo-jun]

It has been almost a year since I sent this Pull request. Please merge this PR.