Added link to SpeakersController.cs
Added link to SpeakersController.cs

Added link to controller code for people who aren't running Visual Studio.
csharpfritz/aspnetcore-app-workshop,jongalloway/aspnetcore-app-workshop,csharpfritz/aspnetcore-app-workshop,dotnet-presentations/aspnetcore-app-workshop,anurse/ConferencePlanner,csharpfritz/aspnetcore-app-workshop,dotnet-presentations/aspnetcore-app-workshop,dotnet-presentations/aspnetcore-app-workshop,anurse/ConferencePlanner,jongalloway/aspnetcore-app-workshop,dotnet-presentations/aspnetcore-app-workshop,csharpfritz/aspnetcore-app-workshop,anurse/ConferencePlanner