Add txt and markdown files to attach feature. (#3135)

Signed-off-by: Adam Treat <treat.adam@gmail.com>
Signed-off-by: AT <manyoso@users.noreply.github.com>
Co-authored-by: Jared Van Bortel <jared@nomic.ai>

gpt4all-chat/CMakeLists.txt

@@ -218,6 +218,7 @@ qt_add_qml_module(chat
       qml/MyDialog.qml
       qml/MyDirectoryField.qml
       qml/MyFileDialog.qml
+      qml/MyFileIcon.qml
       qml/MyFolderDialog.qml
       qml/MyFancyLink.qml
       qml/MyMenu.qml
@@ -252,6 +253,7 @@ qt_add_qml_module(chat
       icons/eject.svg
       icons/email.svg
       icons/file-doc.svg
+      icons/file-docx.svg
       icons/file-md.svg
       icons/file-pdf.svg
       icons/file-txt.svg