Make category pages work.

app/src/templates/categoryTemplate.js

@@ -0,0 +1,14 @@
+import React from "react";
+import { Link } from "gatsby";
+
+const basicTemplate = props => {
+    const { pageContext } = props
+    const { categoryName } = pageContext
+  
+    return (
+        <div>
+            {categoryName}
+        </div>
+    )
+}
+export default basicTemplate