bug: data availability with each environment unclear

Describe the bug

The README table has many resources servers listed with "-" under the dataset column, users have expressed confusion whether data is available or not, and if/when it is coming.

• some environments we procedurally generate data, in these cases there is a script(s) in the resources folder directory for that environment, e.g. reasoning gym
• some of our environments are interfaces to other environment libraries that have their own collections of environments and data, e.g. open env
• some may have associated datasets but missing the link in the README, e.g. equivalence LLM judge can be used with this openQA dataset
• some environments we may have data in progress but not yet released

Steps/Code to reproduce bug

View README table

Expected behavior

More precision around data availability, such that users are able to readily use environments where data is available or can be generated with existing scripts, vs which environments require their own data preparation

Configs
NeMo Gym v0.2.0

Start with the README table and inspect the resources-folder scripts for environments such as reasoning gym. Compare cases like Open Env, equivalence LLM judge, and the referenced OpenQA dataset to determine how availability is currently represented. Done means the README distinguishes generated data, external collections, linked datasets, and data that is not yet released or requires user preparation.