Created scene, prefabs and scripts for startup UI

...ileBrowser/Prefabs/SimpleFileBrowserQuickLink.prefab.meta

AVVR/Assets/Plugins/SimpleFileBrowser/README.txt

AVVR/Assets/Plugins/SimpleFileBrowser/README.txt.meta

AVVR/Assets/Plugins/SimpleFileBrowser/Resources.meta

...impleFileBrowser/Resources/SimpleFileBrowserCanvas.prefab

...FileBrowser/Resources/SimpleFileBrowserCanvas.prefab.meta

AVVR/Assets/Plugins/SimpleFileBrowser/Scripts.meta

...s/Plugins/SimpleFileBrowser/Scripts/EventSystemHandler.cs

...gins/SimpleFileBrowser/Scripts/EventSystemHandler.cs.meta

AVVR/Assets/Plugins/SimpleFileBrowser/Scripts/FileBrowser.cs

...ets/Plugins/SimpleFileBrowser/Scripts/FileBrowser.cs.meta

...leFileBrowser/Scripts/FileBrowserAccessRestrictedPanel.cs

...eBrowser/Scripts/FileBrowserAccessRestrictedPanel.cs.meta

...ugins/SimpleFileBrowser/Scripts/FileBrowserContextMenu.cs

.../SimpleFileBrowser/Scripts/FileBrowserContextMenu.cs.meta

...ins/SimpleFileBrowser/Scripts/FileBrowserCursorHandler.cs

...impleFileBrowser/Scripts/FileBrowserCursorHandler.cs.meta

...wser/Scripts/FileBrowserFileOperationConfirmationPanel.cs

...Scripts/FileBrowserFileOperationConfirmationPanel.cs.meta

...s/Plugins/SimpleFileBrowser/Scripts/FileBrowserHelpers.cs