docs: update README.md and add project license

Author: architxkumar

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2025 Archit Kumar
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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 # Number Guessing Game
 
-A CLI based game where computer randomly selects a number and the user has to guess it.
+Number Guessing is a CLI game where the computer randomly selects a number 
+and the user has to guess it. The user is given a limited number of chances to guess the number. 
+If the user guesses the number correctly, the game ens, and the user wins. Otherwise,
+the game continues until the user runs out of chances.
+</br>
+</br>
+This is a learning project built in Go as part of [roadmap.sh](https://roadmap.sh/projects/number-guessing-game) challenge.
+
+## Features
+
+- Multiple Difficulty levels (easy, medium, hard)
+- Input Validation
+
+## Requirements
+
+- Go 1.19 or later
+
+## Installation
+
+Run the following commands
+
+```bash
+git clone https://github.com/architxkumar/Number-Guessing.git
+cd Number-Guessing
+go build
+```
+
+## Usage
+```bash
+./Number-Guessing
+```
+### Sample Output
+```text
+Welcome to Number Guessing Game!
+I'm thinking of a number between 1 and 100.
+You have limited number of chances to guess the correct number depending upon the difficulty level.
+
+Please select the difficulty level.
+1. Easy (10)
+2. Medium (5)
+3. Hard (3)
+
+Enter your choice: 2
+
+Great! You have selected the Medium level.
+Let's start the game!
+
+
+Enter your guess: 27
+Incorrect! The number is greater than 27
+
+Enter your guess: 60
+Incorrect! The number is greater than 60
+
+Enter your guess: 90
+Incorrect! The number is less than 90
+
+Enter your guess: 85
+Incorrect! The number is less than 85
+
+Enter your guess: 87
+Game Over! You have used all the attempts
+```
+
+## License
+
+This project is licensed under the [MIT License](./LICENSE)