Use constant for the health check endpoint

Author: Sergey Tregub

ProjectTemplates/ReferenceProject/Constants.cs

@@ -8,5 +8,10 @@ public static class Swagger
             public static string ApiName => "My API";
             public static string Version => "v1";
         }
+
+		public static class Health
+		{
+			public static string EndPoint => "/health";
+		}
     }
 }

ProjectTemplates/ReferenceProject/Startup.cs

@@ -165,7 +165,7 @@ public void Configure(IApplicationBuilder app)
 			app.UseEndpoints(endpoints =>
 			{
 				endpoints.MapDefaultControllerRoute();
-				endpoints.MapHealthChecks("/health"); // TODO: Must be documented: https://docs.microsoft.com/en-us/aspnet/core/host-and-deploy/health-checks?view=aspnetcore-3.1
+				endpoints.MapHealthChecks(Constants.Health.EndPoint); // TODO: Must be documented: https://docs.microsoft.com/en-us/aspnet/core/host-and-deploy/health-checks?view=aspnetcore-3.1
 			});
 
 			Logger.LogInformation("Server started");