docs: add initial readme (#6)

* feat: add initial readme

* feat: update readme

readme.md

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+# Candymachine Client SDK
+
+<br/>
+
+## Pre-alpha version
+
+Candymachine Client SDK is currently under development and in pre-alpha version.
+
+## About The Project
+
+Candymachine Client SDK brings to the table the functions, types and other items from the Candy Machine CLI to be compatible with the browser.
+
+### Features
+
+- Create a Candy Machine V2 with multiple and configurable settings:
+  - Captcha enabled/disabled.
+  - Mutability on the NFTs.
+  - Price, number of NFTs.
+  - Authority.
+  - NFTs hosted on Arweave.
+  - Time and date to start the minting.
+- Update any Candy Machine V2 in which you are the authority and have the cache file.
+- Explore any Candy Machine V2, view the minted NFTs, remaining NFTs to mint...
+- Mint a NFT from the Candy Machine V2.
+- Available on Solana's Mainnet and Devnet networks.
+- Fully compatible with React and NextJS.
+
+### Built with
+
+- Typescript
+- Metaplex
+- Anchor from Serum
+- Solana web3.js
+
+<br/>
+
+## Installation
+
+```
+$ npm i @boxfish-studio/candymachine-client-sdk
+$ yarn add @boxfish-studio/candymachine-client-sdk
+$ pnpm add @boxfish-studio/candymachine-client-sdk
+```
+
+<br/>
+
+## How to use
+
+### Upload your first Candy Machine
+
+1. Import `uploadV2, loadCandyProgramV2, StorageType, verifyAssets` functions and enums:
+
+```ts
+import { uploadV2, loadCandyProgramV2, StorageType, verifyAssets } from '@boxfish-studio/candymachine-client-sdk'
+
+async function createCandyMachineV2() {
+        let candyMachine: string = ''
+        const config: ICandyMachineConfig = {
+            price: 1,
+            number: 200,
+            gatekeeper: null,
+            solTreasuryAccount: ******************, // where the NFTs initial sale SOL will go to
+            splTokenAccount: null,
+            splToken: null,
+            goLiveDate: "21 Jul 2023 16:00:00 GMT",
+            endSettings: null,
+            whitelistMintSettings: null,
+            hiddenSettings: null,
+            storage: StorageType.Arweave,
+            ipfsInfuraProjectId: null,
+            ipfsInfuraSecret: null,
+            nftStorageKey: null,
+            awsS3Bucket: null,
+            noRetainAuthority: false,
+            noMutable: false,
+            arweaveJwk: null,
+            batchSize: null,
+            pinataGateway: null,
+            pinataJwt: null,
+            uuid: null,
+        }
+        // files being all the assets uploaded to the page: [0.json, 0.png, 1.json, 1.png....]
+        const { supportedFiles, elemCount } = verifyAssets(files, config.storage, config.number)
+
+        const provider = new AnchorProvider(connection, anchorWallet, {
+            preflightCommitment: 'recent',
+        })
+
+        const anchorProgram = await loadCandyProgramV2(provider)
+
+        const {
+            storage,
+            nftStorageKey,
+            ipfsInfuraProjectId,
+            number,
+            ipfsInfuraSecret,
+            pinataJwt,
+            pinataGateway,
+            arweaveJwk,
+            awsS3Bucket,
+            retainAuthority,
+            mutable,
+            batchSize,
+            price,
+            splToken,
+            treasuryWallet,
+            gatekeeper,
+            endSettings,
+            hiddenSettings,
+            whitelistMintSettings,
+            goLiveDate,
+            uuid,
+        } = await getCandyMachineV2Config(publicKey, config, anchorProgram)
+
+        try {
+            const _candyMachine = await uploadV2({
+                files: supportedFiles,
+                cacheName: 'example',
+                env: "devnet",
+                totalNFTs: elemCount,
+                gatekeeper,
+                storage,
+                retainAuthority,
+                mutable,
+                batchSize,
+                price,
+                treasuryWallet,
+                anchorProgram,
+                walletKeyPair: anchorWallet, // from react solana wallet package
+                endSettings,
+                hiddenSettings,
+                whitelistMintSettings,
+                goLiveDate,
+                rateLimit: null,
+            })
+
+            if (typeof _candyMachine === 'string') candyMachine = _candyMachine
+            console.log("Candy machine v2 successfully created!")
+        } catch (err) {
+            console.error("Error during candy machine v2 upload.")
+        }
+
+    }
+
+```
+
+## Acknowledgements
+
+This SDK has been built thanks to Metaplex's Candy Machine CLI.
+