Add frontend for uploading stuff

src/main/resources/httpd/schematic_upload.html

@@ -49,7 +49,13 @@
 </nav>
 <div style="text-align: center;" class="col-auto m-0 row justify-content-center p-4">
     <h2>Plex HTTPD</h2>
-    <h5>Page coming soon.</h5>
+    <div class="mb-3 col-6">
+        <label for="formFile" class="form-label">Please select a schematic file to upload.</label>
+        <div class="input-group mb-3">
+            <input class="form-control" type="file" id="formFile">
+            <button class="btn btn-outline-primary" type="button" id="upload">Upload</button>
+        </div>
+    </div>
 </div>
 </body>
 </html>