add txt icon

src/SharpIDE.Godot/Features/SolutionExplorer/Resources/FileExtensions/TxtFile.svg

@@ -0,0 +1,55 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   class="mud-icon-root mud-svg-icon mud-error-text mud-icon-size-medium"
+   focusable="false"
+   viewBox="0 0 24 24"
+   aria-hidden="true"
+   role="img"
+   style="fill: rgb(40, 167, 69);"
+   version="1.1"
+   id="svg1"
+   sodipodi:docname="TxtFile.svg"
+   inkscape:version="1.4.2 (f4327f4, 2025-05-13)"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <defs
+     id="defs1" />
+  <sodipodi:namedview
+     id="namedview1"
+     pagecolor="#505050"
+     bordercolor="#eeeeee"
+     borderopacity="1"
+     inkscape:showpageshadow="0"
+     inkscape:pageopacity="0"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#505050"
+     inkscape:zoom="34.383067"
+     inkscape:cx="13.524099"
+     inkscape:cy="15.778115"
+     inkscape:window-width="2560"
+     inkscape:window-height="1369"
+     inkscape:window-x="-8"
+     inkscape:window-y="-8"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="svg1" />
+  <path
+     style="fill:#dfdfdf;fill-opacity:1;stroke:#dfdfdf;stroke-width:1.3;stroke-linecap:square;stroke-linejoin:round;stroke-dasharray:none;stroke-opacity:1"
+     d="M 3.3982194,6.021161 H 20.60178"
+     id="path1" />
+  <path
+     style="fill:#dfdfdf;fill-opacity:1;stroke:#dfdfdf;stroke-width:1.3;stroke-linecap:square;stroke-linejoin:round;stroke-dasharray:none;stroke-opacity:1"
+     d="M 3.3982201,10.007054 H 14.955588"
+     id="path1-5"
+     sodipodi:nodetypes="cc" />
+  <path
+     style="fill:#dfdfdf;fill-opacity:1;stroke:#dfdfdf;stroke-width:1.3;stroke-linecap:square;stroke-linejoin:round;stroke-dasharray:none;stroke-opacity:1"
+     d="M 3.3982199,17.978839 H 14.955588"
+     id="path1-5-1"
+     sodipodi:nodetypes="cc" />
+  <path
+     style="fill:#dfdfdf;fill-opacity:1;stroke:#dfdfdf;stroke-width:1.3;stroke-linecap:square;stroke-linejoin:round;stroke-dasharray:none;stroke-opacity:1"
+     d="M 3.3982199,13.992946 H 20.60178"
+     id="path1-8" />
+</svg>

src/SharpIDE.Godot/Features/SolutionExplorer/Resources/FileExtensions/TxtFile.svg.import

@@ -0,0 +1,18 @@
+[remap]
+
+importer="svg"
+type="DPITexture"
+uid="uid://b6bpjhs2o1j2l"
+path="res://.godot/imported/TxtFile.svg-e8180c586877b8644302859d58c868c5.dpitex"
+
+[deps]
+
+source_file="res://Features/SolutionExplorer/Resources/FileExtensions/TxtFile.svg"
+dest_files=["res://.godot/imported/TxtFile.svg-e8180c586877b8644302859d58c868c5.dpitex"]
+
+[params]
+
+base_scale=1.0
+saturation=1.0
+color_map={}
+compress=true

src/SharpIDE.Godot/Features/SolutionExplorer/SolutionExplorerPanel.FileIcons.cs

@@ -9,6 +9,7 @@ public partial class SolutionExplorerPanel
     private readonly Texture2D _razorIcon = ResourceLoader.Load<Texture2D>("uid://cff7jlvj2tlg2");
     private readonly Texture2D _jsonIcon = ResourceLoader.Load<Texture2D>("uid://csrwpjk77r731");
     private readonly Texture2D _jsIcon = ResourceLoader.Load<Texture2D>("uid://cpdobpjrm2suc");
+    private readonly Texture2D _txtIcon = ResourceLoader.Load<Texture2D>("uid://b6bpjhs2o1j2l");
 
     private Texture2D GetIconForFileExtension(string fileExtension)
     {
@@ -18,6 +19,7 @@ public partial class SolutionExplorerPanel
             ".razor" or ".cshtml" => _razorIcon,
             ".json" => _jsonIcon,
             ".js" => _jsIcon,
+            ".txt" => _txtIcon,
             _ => _csIcon
         };    
         return texture;