Create the Project Manager project (#320)

* Created the Project Manager project with a barebone styled window and rough sketch of first screen

* Renamed to Project Manager, ect.

* Corrected string name for projectmanager and added comments on getting engine path

* Changed output name for Project Manager to lowercase o3de

* Added header guards

Code/Tools/ProjectManager/Qt/ProjectManagerWindow.h

@@ -0,0 +1,38 @@
+/*
+ * All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
+ * its licensors.
+ *
+ * For complete copyright and license terms please see the LICENSE at the root of this
+ * distribution (the "License"). All use of this software is governed by the License,
+ * or, if provided, by the license below or the license accompanying this file. Do not
+ * remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *
+ */
+#pragma once
+
+#if !defined(Q_MOC_RUN)
+#include <QMainWindow>
+
+#include <AzCore/IO/Path/Path_fwd.h>
+#endif
+
+namespace Ui
+{
+    class ProjectManagerWindowClass;
+}
+
+namespace ProjectManager
+{
+    class ProjectManagerWindow : public QMainWindow
+    {
+
+    public:
+        explicit ProjectManagerWindow(QWidget* parent, const AZ::IO::PathView& engineRootPath);
+        ~ProjectManagerWindow();
+
+    private:
+        QScopedPointer<Ui::ProjectManagerWindowClass> m_ui;
+    };
+
+} // namespace ProjectManager