Add Built-in Services table

Copy from #236 by @sgjsakura

Fundamentals -> Dependency Injection -> Built-in Services.

A Table which includes all ASP.NET 5 Built-in Services (e.g. IHttpContextAccessor), together with their type (Scoped, Transient, or Singleton) and major function. This topic may especially useful while either creating custom services or writing application code.

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#### Document Details

⚠ *Do not edit this section. It is required for docs.microsoft.com ➟ GitHub issue linking.*

* ID: 793395fe-c738-22ce-d0e9-29a850c0fa88
* Version Independent ID: 0546ce3a-3258-9817-0f3f-13281c2f55da
* Content: [Application startup in ASP.NET Core](https://docs.microsoft.com/en-us/aspnet/core/fundamentals/startup?view=aspnetcore-2.1#services-available-in-startup)
* Content Source: [aspnetcore/fundamentals/startup.md](https://github.com/aspnet/Docs/blob/master/aspnetcore/fundamentals/startup.md)
* Product: **aspnet-core**
* GitHub Login: @ardalis
* Microsoft Alias: **tdykstra**