adds example of a pool + removes entry fun (#4544)

sui_programmability/examples/defi/sources/pool.move

@@ -9,6 +9,24 @@
 /// - Fees are customizable per Pool.
 /// - Max stored value for both tokens is: U64_MAX / 10_000
 ///
+/// To publish a new pool, a type is required. Eg:
+/// ```
+/// module me::my_pool {
+/// use defi::pool;
+///
+/// struct POOL_TEAM has drop {}
+///
+/// entry fun create_pool<T>(
+/// token: Coin<T>,
+/// sui: Coin<SUI>,
+/// fee_percent: u64,
+/// ctx: &mut TxContext
+/// ) {
+/// pool::create_pool(POOL_TEAM {}, token, sui, fee_percent, ctx)
+/// }
+/// }
+/// ```
+///
 /// This solution is rather simple and is based on the example from the Move repo:
 /// https://github.com/move-language/move/blob/main/language/documentation/examples/experimental/coin-swap/sources/CoinSwap.move
 module defi::pool {
@@ -68,21 +86,6 @@ module defi::pool {
  /// to create a type which will mark LSPs.
  fun init(_: &mut TxContext) {}
 
- /// Entrypoint for the `create_pool` method.
- entry fun create_pool_<P: drop, T>(
- witness: P,
- token: Coin<T>,
- sui: Coin<SUI>,
- // share: u64,
- fee_percent: u64,
- ctx: &mut TxContext
- ) {
- transfer::transfer(
- create_pool(witness, token, sui, /* share, */ fee_percent, ctx),
- tx_context::sender(ctx)
- )
- }
-
  /// Create new `Pool` for token `T`. Each Pool holds a `Coin<T>`
  /// and a `Coin<SUI>`. Swaps are available in both directions.
  ///