Created a first draft of this action. (#14)

Reviewed-on: #14
Co-authored-by: Philipp Horstenkamp <philipp@horstenkamp.de>
Co-committed-by: Philipp Horstenkamp <philipp@horstenkamp.de>

node_modules/undici/docs/api/CacheStorage.md

@@ -0,0 +1,30 @@
+# CacheStorage
+
+Undici exposes a W3C spec-compliant implementation of [CacheStorage](https://developer.mozilla.org/en-US/docs/Web/API/CacheStorage) and [Cache](https://developer.mozilla.org/en-US/docs/Web/API/Cache).
+
+## Opening a Cache
+
+Undici exports a top-level CacheStorage instance. You can open a new Cache, or duplicate a Cache with an existing name, by using `CacheStorage.prototype.open`. If you open a Cache with the same name as an already-existing Cache, its list of cached Responses will be shared between both instances.
+
+```mjs
+import { caches } from 'undici'
+
+const cache_1 = await caches.open('v1')
+const cache_2 = await caches.open('v1')
+
+// Although .open() creates a new instance,
+assert(cache_1 !== cache_2)
+// The same Response is matched in both.
+assert.deepStrictEqual(await cache_1.match('/req'), await cache_2.match('/req'))
+```
+
+## Deleting a Cache
+
+If a Cache is deleted, the cached Responses/Requests can still be used.
+
+```mjs
+const response = await cache_1.match('/req')
+await caches.delete('v1')
+
+await response.text() // the Response's body
+```