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/project_manager_files.cmake

@@ -0,0 +1,21 @@
+#
+# 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.
+#
+
+set(FILES
+    project_manager.qrc
+    source/main.cpp
+    Qt/FirstTimeUse.h
+    Qt/FirstTimeUse.cpp
+    Qt/FirstTimeUse.ui
+    Qt/ProjectManagerWindow.h
+    Qt/ProjectManagerWindow.cpp
+    Qt/ProjectManagerWindow.ui
+)