fix readme description

scraper/cache.ts

@@ -0,0 +1,30 @@
+import Debug from "debug";
+import { existsSync, mkdirSync, readFileSync, writeFileSync } from "fs"
+
+const debug = Debug(`olympics-calendar:cache`);
+
+const cachePath = (key: string): string => {
+  return `../cache/${key}`;
+}
+
+export const get = (key: string): string | null => {
+  debug(`get: key=${key}`);
+  const path = cachePath(key);
+  if (existsSync(path)) {
+    return readFileSync(path, "utf-8");
+  }
+  return null;
+}
+
+export const has = (key: string): boolean => {
+  debug(`has: key=${key}`);
+  const path = cachePath(key);
+  return existsSync(path);
+}
+
+export const set = (key: string, data: string): void => {
+  debug(`set: key=${key}`);
+  const path = cachePath(key);
+  mkdirSync(path.split("/").slice(0, -1).join("/"), { recursive: true });
+  writeFileSync(path, data);
+}