feat(metering): Metering reference page (#3704)

* draft metering page

Signed-off-by: Diana <[email protected]>

* appease vale

Signed-off-by: Diana <[email protected]>

* Update app/metering-and-billing/metering.md

---------

Signed-off-by: Diana <[email protected]>
Co-authored-by: Angel <[email protected]>

Author: cloudjumpercat

.github/styles/base/Dictionary.txt

@@ -278,6 +278,7 @@ gojira
 Golang
 Goroutine
 Goroutine
+GPUs
 gbps
 grafana
 Grafana