Start evita nft3

contracts/EvitaNFT.sol

@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.4;
+
+import '@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol';
+import '@openzeppelin/contracts-upgradeable/token/ERC721/ERC721Upgradeable.sol';
+import '@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol';
+import '@openzeppelin/contracts/utils/Counters.sol';
+
+contract EvitaNFT is ERC721Upgradeable, OwnableUpgradeable {
+    using Counters for Counters.Counter;
+    Counters.Counter private _tokenIdCounter;
+    mapping(string => uint8) public existingURIs;
+    mapping(uint256 => string) private tokenURIs;
+
+    function initialize(string memory name_, string memory symbol_)
+        public
+        initializer
+    {
+        __Ownable_init(); // OwnableUpgradeable
+        __ERC721_init(name_, symbol_); //name_ = "EvitaNFT";  symbol_ = "EVN";
+        __Context_init(); // ContextUpgradeable
+    }
+
+    function Mint(address recipient, string memory metadataURI)
+        public
+        onlyOwner
+        returns (uint256)
+    {
+        require(existingURIs[metadataURI] != 1, 'NFT already minted!');
+        uint256 newItemId = _tokenIdCounter.current();
+        _tokenIdCounter.increment();
+        existingURIs[metadataURI] = 1;
+
+        _mint(recipient, newItemId);
+
+        setTokenURI(newItemId, metadataURI); //take setTokenURI from ERC721URIStorage.sol
+
+        return newItemId;
+    }
+
+    function setTokenURI(uint256 tokenId, string memory _tokenURI)
+        internal
+        virtual
+        onlyOwner
+    {
+        require(
+            _exists(tokenId),
+            'ERC721URIStorage: URI set of nonexistent token'
+        );
+        tokenURIs[tokenId] = _tokenURI;
+    }
+}