docs: add readme

README.md

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+# Sort Array By Letter
+
+## Description
+
+This utility takes a user input of array string number and sort it by the letter of each element. The utility will then display the sorted array.
+
+## Table of Contents
+
+- [Installation](#installation)
+- [Usage](#usage)
+
+## Installation
+
+To use the code in this repository, you need to have [Node.js](https://nodejs.org/en) installed on your machine. Clone the repository to your local system using the following command:
+
+```
+git clone https://github.com/afiqzudinhadi/sort-by-letters.git
+```
+
+Install the required dependencies by running the following command:
+
+```
+npm install
+```
+
+## Usage
+
+1. Navigate to the repository's root directory.
+2. Open terminal or command prompt.
+3. Run the following command to execute the code:
+
+```
+npm run index
+```
+
+4. Follow the on-screen instructions to input the array of strings.