Updated AppVeyor config to Visual Studio 2019

Added missing DateRange
Added VSCode tasks.json

.vscode/tasks.json

@@ -0,0 +1,24 @@
+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "build",
+            "command": "dotnet",
+            "type": "shell",
+            "args": [
+                "build",
+                // Ask dotnet build to generate full paths for file names.
+                "/property:GenerateFullPaths=true",
+                // Do not generate summary otherwise it leads to duplicate errors in Problems panel
+                "/consoleloggerparameters:NoSummary"
+            ],
+            "group": "build",
+            "presentation": {
+                "reveal": "silent"
+            },
+            "problemMatcher": "$msCompile"
+        }
+    ]
+}

Workshop/02-EventSourcingAdvanced/MeetingsManagement/Meetings/ValueObjects/DateRange.cs

@@ -0,0 +1,30 @@
+using System;
+
+namespace MeetingsManagement.Meetings.ValueObjects
+{
+    public class DateRange
+    {
+        public DateTime Start { get; }
+        public DateTime End { get; }
+
+        public DateRange(DateTime start, DateTime end)
+        {
+            Start = start;
+            End = end;
+        }
+
+        public static DateRange Create(DateTime start, DateTime end)
+        {
+            if (start == default(DateTime))
+                throw new ArgumentException($"{nameof(start)} needs to be defined.");
+
+            if (end == default(DateTime))
+                throw new ArgumentException($"{nameof(end)} needs to be defined.");
+
+            if (start > end)
+                throw new ArgumentException($"{nameof(start)} needs to be earlier or equal {nameof(end)}.");
+
+            return new DateRange(start, end);
+        }
+    }
+}

appveyor.yml

@@ -1,5 +1,5 @@
 version: 1.0.{build}
-image: Visual Studio 2017
+image: Visual Studio 2019
 before_build:
 - cmd: dotnet restore
 build: