docs: add caching

Signed-off-by: Wing-Kam Wong <wingkwong.code@gmail.com>

packages/noco-docs/content/en/developer-resources/caching.md

@@ -0,0 +1,9 @@
+---
+title: 'Caching'
+description: 'Caching'
+position: 1300
+category: 'Developer Resources'
+menuTitle: 'Caching'
+---
+
+We introduced a Caching layer to store meta data by utilising Redis. By default, caching is enabled. If you prefer not to cache, you can configure it by setting environment variable `NC_DISABLE_CACHE` to `true`. You can also use your own Redis instance by setting environment variable `NC_REDIS_URL` (e.g. `redis://:authpassword@127.0.0.1:6380/4`). If you don't specify it, by default, it will be cached in memory.