Create sep-nft.md

contract/sep-nft.md

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+## Preamble
+
+```
+CIP: 
+Title: NFT
+Author: Stellar Development Foundation <@stellar>
+Status: Draft
+Discussion: TBD
+Created: 2023-10-11
+Version 0.1.0
+```
+
+## Summary
+
+This proposal defines a standard interface that NFTs on Soroban powered
+networks, such as the Stellar network, can implement to interoperate with
+contracts that use NFTs, and Stellar assets.
+
+## Motivation
+
+A non-fungible asset is ...
+
+## Abstract
+
+This proposal introduces a contract interface for NFTs. The interface is ...
+
+The interface tries to follow an ERC-721 model.
+
+## Specification
+
+```rust
+pub trait Interface {
+    fn balance_of(env: Env, owner: Address) -> u32;
+    fn transfer_from(env: Env, spender: Address, from: Address, to: Address, token_id: u32);
+    fn approve(
+        env: Env,
+        caller: Address,
+        operator: Option<Address>,
+        token_id: u32,
+        expiration_ledger: u32,
+    );
+    fn set_approval_for_all(
+        env: Env,
+        caller: Address,
+        owner: Address,
+        operator: Address,
+        approved: bool,
+        expiration_ledger: u32,
+    );
+    fn get_approved(env: Env, token_id: u32) -> Option<Address>;
+    fn is_approval_for_all(env: Env, owner: Address, operator: Address) -> bool;
+}
+```
+
+## Changelog
+
+- `v0.1.0` - Initial draft based on CIP-001.
+
+## Implementations
+
+TBD