examples/ft: small readme improvement
I made this change in and figured
I'd backport it here since it's useful for both.
-# Fungible token
+Fungible Token (FT)
+===================
-Example implementation of a Fungible Token Standard ([NEP-141](https://github.com/near/NEPs/issues/141)).
+Example implementation of a [Fungible Token] contract which uses [near-contract-standards] and [simulation] tests.
+
+ [Fungible Token]: https://nomicon.io/Standards/Tokens/FungibleTokenCore.html
+ [near-contract-standards]: https://github.com/near/near-sdk-rs/tree/master/near-contract-standards
+ [simulation]: https://github.com/near/near-sdk-rs/tree/master/near-sdk-sim
NOTES:
- The maximum balance value is limited by U128 (2**128 - 1).
