feat: implement file upload functionality

src/pages/student/additional_page.rs

@@ -1,4 +1,5 @@
 use leptos::prelude::*;
+use crate::components::FileDrop;
 
 #[component]
 pub fn AdditionalPage() -> impl IntoView {
@@ -8,6 +9,8 @@ pub fn AdditionalPage() -> impl IntoView {
             <div class="text-lg">
                 "This is just a placeholder for now. We'll show redirect buttons to each form."
             </div>
+            <div class="text-lg">"Here's a testing file input!"</div>
+            <FileDrop name="testing" form_id="student_additional"/>
         </div>
     }
 }