Add: image database table, image test site, image upload support

app/controllers/test/images_controller.rb

@@ -0,0 +1,25 @@
+class Test::ImagesController < ApplicationController
+  def index
+    @images = Image.all
+    @image = Image.new
+  end
+
+  def create
+    @image = Image.new(image_params)
+
+    if @image.save
+      respond_to do |format|
+        format.turbo_stream
+        format.html { redirect_to test_images_path }
+      end
+    else
+      render :index, status: :unprocessable_entity
+    end
+  end
+
+  private
+
+  def image_params
+    params.require(:image).permit(:title, :file)
+  end
+end