add to description

app.py

@@ -12,7 +12,9 @@ def greet(private_key):
     return wallet.address
 
 description = (
-    "This demo calculate the number of tokens in your wallet using the Ocean Python library. "
+    "This demo calculate the number of tokens in your wallet on the Rinkeby test network using the Ocean Python library. "
+    "You can export your private key from your metamask wallet. We highly recommend doing this with a wallet that has no real tokens in it (only Rinkeby tokens)."
+    "For more info on private keys, see [this](https://github.com/oceanprotocol/ocean.py/blob/main/READMEs/wallets.md) from the ocean.py documentation"
 )
 
 article = (