Update BUILD.md (immutable#217)

Added deploy step example

BUILD.md

@@ -48,3 +48,34 @@ To check the test coverage based on Foundry tests use:
  ```
  forge coverage
  ```
+
+## Deploy
+
+To deploy the contract with foundry use the following command:
+
+Additional Links: 
+
+[Operator Allowlist Address](https://docs.immutable.com/docs/zkevm/products/minting/royalties/allowlist-spec/#operator-allowlist-values)
+```
+forge create --rpc-url <RPC_URL> --constructor-args <CONSTRUCTOR_ARGUMENTS> --private-key <DEPLOYER_PRIVATE_KEY> <PATH_TO_CONTRACT:CONTRACT> --gas-price <GAS_PRICE>  --priority-gas-price <PRIORITY_GAS_PRICE>
+```
+
+An example for deploying an Immutable ERC721 preset on testnet:
+
+```
+forge create \
+--rpc-url "https://rpc.testnet.immutable.com" \
+--constructor-args "0xD509..." \
+"Imaginary Immutable Iguanas" \
+"III" \
+"https://example-base-uri.com/" \
+"https://example-contract-uri.com/" \
+"0x6b969FD89dE634d8DE3271EbE97734FEFfcd58eE" \
+"0xD509..." \
+"2000" \
+--private-key "7e03....." \
+contracts/token/erc721/preset/ImmutableERC721.sol:ImmutableERC721 \
+--gas-price 20000000000 \
+--priority-gas-price 20000000000
+
+```