Added the capability to upload CSV files

templates/categories_new.html

@@ -0,0 +1,28 @@
+{% extends "base.html" %}
+{% block title %}Create category{% endblock title %}
+{% block body %}
+  <form action="/categories/new" method="post" class="flex flex-col">
+    <label class="grow">
+      Name
+      <input type="text" name="name" />
+    </label>
+    <label class="grow">
+      Description
+      <input type="text" name="description" />
+    </label>
+    <button type="submit">Submit</button>
+  </form>
+  <style>
+    label {
+      width: 100%;
+    }
+
+    input {
+      width: 100%;
+      border: 1px solid black;
+      border-radius: 3px;
+      padding: 0.25rem;
+      margin: 0.25rem;
+    }
+  </style>
+{% endblock body %}