Add a first cut at an express-based backend

express/content-types.ts

@@ -0,0 +1,40 @@
+import { Extensible } from "./interfaces";
+
+export type ContentType = string;
+
+// FIXME: Fill this out (get an AI to do it)
+
+const contentTypes = {
+    text: {
+        plain: "text/plain",
+        html: "text/html",
+        css: "text/css",
+        javascript: "text/javascript",
+        xml: "text/xml",
+    },
+    image: {
+        jpeg: "image/jpeg",
+        png: "image/png",
+        gif: "image/gif",
+        svgPlusXml: "image/svg+xml",
+        webp: "image/webp",
+    },
+    audio: {
+        mpeg: "audio/mpeg",
+        wav: "audio/wav",
+    },
+    video: {
+        mp4: "video/mp4",
+        webm: "video/webm",
+        xMsvideo: "video/x-msvideo",
+    },
+    application: {
+        json: "application/json",
+        pdf: "application/pdf",
+        zip: "application/zip",
+        xWwwFormUrlencoded: "x-www-form-urlencoded",
+        octetStream: "octet-stream",
+    },
+};
+
+export { contentTypes };