Update README.md (MystenLabs#3118)

add virtual currency use case

sui_programmability/examples/fungible_tokens/README.md

@@ -1,6 +1,6 @@
 # Fungible Tokens
 
-* MANAGED: a token managed by a treasurer trusted for minting and burning. This is how (e.g.) a fiat-backed stablecoin would work.
+* MANAGED: a token managed by a treasurer trusted for minting and burning. This is how (e.g.) a fiat-backed stablecoin or an in-game virtual currency would work.
 * BASKET: a synthetic token backed by a basket of other assets. This how (e.g.) a [Special Drawing Rights (SDR)](https://www.imf.org/en/About/Factsheets/Sheets/2016/08/01/14/51/Special-Drawing-Right-SDR)-like asset would work.
 * regulated_coin: a coin managed by a central authority which can freeze accounts
 * FIXED: a token with a fixed supply (coming soon).