Add wandb_entity to wandb options, update example configs, update README (#361)

* Update wandb_entity and add wandb descriptions

* add wandb to config section

* remove trailing whitespace for pre-commit hook

* remove trailing whitespace for pre-commit hook

---------

Co-authored-by: Morgan McGuire <morganmcguire@Morgans-MacBook-Pro.local>
Co-authored-by: Wing Lian <wing.lian@gmail.com>

src/axolotl/utils/wandb.py

@@ -9,6 +9,8 @@ def setup_wandb_env_vars(cfg):
     elif cfg.wandb_project and len(cfg.wandb_project) > 0:
         os.environ["WANDB_PROJECT"] = cfg.wandb_project
         cfg.use_wandb = True
+        if cfg.wandb_entity and len(cfg.wandb_entity) > 0:
+            os.environ["WANDB_ENTITY"] = cfg.wandb_entity
         if cfg.wandb_watch and len(cfg.wandb_watch) > 0:
             os.environ["WANDB_WATCH"] = cfg.wandb_watch
         if cfg.wandb_log_model and len(cfg.wandb_log_model) > 0: