Migrate to TypeScript (#1)

* rf: js -> ts

* [m] docs: add badges, lint

Middleware.ts

@@ -0,0 +1,9 @@
+export default (isOnSpamWatch) => {
+  return async (ctx, next) => {
+    if (await isOnSpamWatch(ctx.from.id)) {
+      console.log(`User ${ctx.from.id} is banned on SpamWatch. Blocking command.`);
+      return;
+    }
+    await next();
+  };
+};