Initial release of the Windows Terminal source code

This commit introduces all of the Windows Terminal and Console Host source,
under the MIT license.

src/types/FocusEvent.cpp

@@ -0,0 +1,27 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
+#include "precomp.h"
+#include "inc/IInputEvent.hpp"
+
+FocusEvent::~FocusEvent()
+{
+}
+
+INPUT_RECORD FocusEvent::ToInputRecord() const noexcept
+{
+    INPUT_RECORD record{ 0 };
+    record.EventType = FOCUS_EVENT;
+    record.Event.FocusEvent.bSetFocus = !!_focus;
+    return record;
+}
+
+InputEventType FocusEvent::EventType() const noexcept
+{
+    return InputEventType::FocusEvent;
+}
+
+void FocusEvent::SetFocus(const bool focus) noexcept
+{
+    _focus = focus;
+}