Add FileSystem Rust module.

qml/ClideEditor.qml

@@ -5,10 +5,16 @@ import QtQuick.Layouts
 import clide.module 1.0
 
 SplitView {
+    id: root
     Layout.fillHeight: true
     Layout.fillWidth: true
     orientation: Qt.Vertical
 
+    // The path to the file to show in the text editor.
+    // This is updated by a signal caught within ClideProjectView.
+    // Initialized by the Default trait for the Rust QML singleton FileSystem.
+    required property string filePath;
+
     // Customized handle to drag between the Editor and the Console.
     handle: Rectangle {
         border.color: SplitHandle.pressed ? RustColors.pressed : SplitHandle.hovered ? RustColors.hovered : RustColors.gutter
@@ -102,6 +108,7 @@ SplitView {
                 // selectionColor: RustColors.editor_highlight
                 textFormat: Qt.AutoText
                 wrapMode: TextArea.Wrap
+                text: FileSystem.readFile(root.filePath)
 
                 background: Rectangle {
                     color: RustColors.editor_background

qml/ClideProjectView.qml

@@ -51,5 +51,7 @@ SplitView {
         }
     }
     ClideEditor {
+        // Initialize using the Default trait in Rust QML singleton FileSystem.
+        filePath: FileSystem.filePath
     }
 }