Update README

README.md

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+<p align="center">
+  <a href="https://github.com/rockets-hq/cashramp-sdk-node/"><img src="https://github.com/rockets-hq/cashramp-sdk-node/actions/workflows/test.yml/badge.svg" /></a>
+  <img alt="Last Commit" src="https://badgen.net/github/last-commit/rockets-hq/cashramp-sdk-node" />
+  <a href="https://www.npmjs.com/package/cashramp"><img src="https://img.shields.io/npm/v/cashramp.svg"/></a>
+  <img alt="Bundle Size" src="https://badgen.net/bundlephobia/minzip/cashramp"/>
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+  <a href="https://github.com/rockets-hq/cashramp-sdk-node/"><img src="https://img.shields.io/npm/l/cashramp.svg"/></a>
+</p>
+
 # Cashramp SDK
 
 This is the official NodeJS SDK for [Cashramp's API](https://cashramp.co/commerce).
+
+### ➕ Installation
+
+```bash
+# NPM
+npm install cashramp --save
+
+# Yarn
+yarn add cashramp
+```
+
+### 👨🏾‍💻 Setup
+
+```js
+const Cashramp = require("cashramp");
+
+const cashrampAPI = new Cashramp({
+  env: "test", // Can be either `test` or `live`
+  secretKey: "CSHRMP-SECK_apE0rjq1tiWl6VLB",
+});
+```
+
+### 📨 Querying the API
+
+The Cashramp SDK has methods for frequently used queries and mutations. Additionally, you can construct your own query/mutation and query the API directly.
+
+_Here's a simple query to fetch the countries Cashramp is available in. Alternatively, you can use `Cashramp#getAvailableCountries()`._
+
+```js
+const query = `
+  query {
+    availableCountries {
+      id
+      name
+      code
+      currency {
+        isoCode
+        name
+      }
+    }
+  }
+`;
+
+const response = await cashrampAPI.sendRequest({
+  name: "availableCountries",
+  query,
+});
+
+if (response.success) {
+  console.log(response.result); // `result` contains the list of countries
+}
+```
+
+## Queries
+
+#### Available countries
+
+```js
+// Fetch the countries that Cashramp is available in
+const response = await cashrampAPI.getAvailableCountries();
+```
+
+#### Market rate
+
+```js
+// Fetch the Cashramp market rate for a country
+const response = await cashrampAPI.getMarketRate({ countryCode: "GH" });
+```
+
+#### Payment method types
+
+```js
+// Fetch the payment method types available in a country
+const response = await cashrampAPI.getPaymentMethodTypes({
+  country:
+    "VHlwZXM6OkNvdW50cnktZWMyOTY3N2QtMGYyYS00NjYzLWIzNDgtNGE5MDIxZWFmNGY3",
+});
+```
+
+#### Rampable assets
+
+```js
+// Fetch the assets you can on/offramp with the Onchain Ramp
+const response = await cashrampAPI.getRampableAssets();
+```
+
+#### Ramp limits
+
+```js
+// Fetch the Onchain Ramp limits
+const response = await cashrampAPI.getRampLimits();
+```
+
+#### Payment request
+
+```js
+// Fetch the details of a payment request
+const response = await cashrampAPI.getPaymentRequest({
+  reference: "test_ref_1",
+});
+```
+
+#### Account
+
+```js
+// Fetch your account's balance & deposit address
+const response = await cashrampAPI.getAccount();
+```
+
+## Mutations
+
+#### Confirm transaction
+
+```js
+// Confirm a crypto transfer sent into Cashramp's Secure Escrow address
+const response = await cashrampAPI.confirmTransaction({
+  paymentRequest:
+    "VHlwZXM6OkNhc2hyYW1wOjpBUEk6Ok1lcmNoYW50UGF5bWVudFJlcXVlc3QtYTgwMWQ1NjAtOTYyYi00MjJkLWEyYzItZjY2NzZhZGE4NDY5",
+  transactionHash:
+    "0x9378c8f2940105debec0c436127f577440b611cf3b92d2967cca53c34c67612a",
+});
+```
+
+#### Initiate hosted payment
+
+```js
+// Initiate a payment request
+const response = await cashrampAPI.initiateHostedPayment({
+  amount: 20,
+  paymentType: "deposit",
+  countryCode: "NG",
+  currency: "usd",
+  email: "[email protected]",
+  reference: "test_ref_1",
+  redirectUrl: "https://example.com/order/success?id=test_ref_1",
+  firstName: "Jane",
+  lastName: "Dore",
+});
+```
+
+#### Cancel hosted payment
+
+```js
+// Cancel an initiated payment request
+const response = await cashrampAPI.cancelHostedPayment({
+  paymentRequest:
+    "VHlwZXM6OkNhc2hyYW1wOjpBUEk6Ok1lcmNoYW50UGF5bWVudFJlcXVlc3QtYTY3MWVhZjQtYmVmYy00ZTEwLWI4YTQtZjk5MDZlNzZhNGUw",
+});
+```
+
+#### Create a customer
+
+```js
+// Create a customer
+const response = await cashrampAPI.createCustomer({
+  firstName: "Jane",
+  lastName: "Doe",
+  email: "[email protected]",
+  country:
+    "VHlwZXM6OkNvdW50cnktOWY5MWE5NGYtNDUxYi00YWEyLWI2NjgtNjQ3YTM2ZDFjZmZh",
+});
+```
+
+#### Add payment method
+
+```js
+// Add a payment method for an existing customer
+const response = await cashrampAPI.addPaymentMethod({
+  customer:
+    "VHlwZXM6OkNhc2hyYW1wOjpBUEk6Ok1lcmNoYW50Q3VzdG9tZXItYTI5OGVmY2UtMGZjMy00YjBlLTgyNzAtYmM3Nzg5MzVjMjI0",
+  paymentMethodType:
+    "VHlwZXM6OkNhc2hyYW1wOjpQMlBQYXltZW50TWV0aG9kVHlwZS04MjZiYzhkNC04NTFlLTRhNGMtYjY3Zi04OGEwOThiZWMyNjE=",
+  fields: [
+    { identifier: "name", value: "Jane Doe" },
+    { identifier: "phone_number", value: "0554078900" },
+  ],
+});
+```
+
+#### Withdraw onchain
+
+```js
+// Withdraw from your balance to an onchain wallet address
+const response = await cashrampAPI.withdrawOnchain({
+  address: "TQuFSvpct2FeBrKjRh8NDqtGAci2Z15RSe",
+  amountUsd: 20,
+});
+```