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.qrc

@@ -0,0 +1,8 @@
+<!DOCTYPE RCC><RCC version="1.0">
+    <qresource>
+        <file>Resources/ProjectManager.qss</file>
+        <file>Resources/Add.svg</file>
+        <file>Resources/Select_Folder.svg</file>
+        <file>Resources/o3de_editor.ico</file>
+    </qresource>
+</RCC>