Updating README.md

updating README.md

Some of the things which could be added to the current README-
- Usage of the project: (i.e. How you would like to run the application)
- Prerequisites need to more clear: (Java is mentioned as a prerequisite. But no version is mentioned. The code might not function properly in all versions of Java)

A README like the following should be fun. Made the following by taking reference from these 2 links-
https://github.com/othneildrew/Best-README-Template
&
https://shields.io/

___________________________________________________________________________________________

[![Contributors][contributors-shield]][contributors-url]
[![Forks][forks-shield]][forks-url]
[![Stargazers][stars-shield]][stars-url]
[![Issues][issues-shield]][issues-url]

# Basic Calculator
## Table of Contents

* [About the Project](#about-the-project)
* [Built With](#built-with)
* [Getting Started](#getting-started)
* [Prerequisites](#prerequisites)
* [Installation](#installation)
* [Usage](#usage)
* [Contact](#contact)

## About The Project
I made this calculator using Applets in JAVA. If you find it helpfull consider giving a star.

### Built With
* [Java-openjdk-8](https://openjdk.java.net/install/)
* //TODO- Other frameworks/download links can be added the same way

## Getting Started
This is an example of how you may give instructions on setting up your project locally.
To get a local copy up and running follow these simple example steps.

### Prerequisites
Any other pre requisite details can be mentioned here along with the installation instructions below-
```sh
// TODO
```

## Usage

Use this space to show useful examples of how a project can be used. Additional screenshots, code examples and demos work well in this space. You may also link to more resources.

_For more examples, please refer to the [Documentation](https://example.com)_

## Contributing
Contributions are what make the open source community such an amazing place to be learn, inspire, and create. Any contributions you make are **greatly appreciated**.

1. Fork the Project
2. Create your Feature Branch (`git checkout -b feature/AmazingFeature`)
3. Commit your Changes (`git commit -m 'Add some AmazingFeature'`)
4. Push to the Branch (`git push origin feature/AmazingFeature`)
5. Open a Pull Request

## Contact

Your Name - [@your_twitter](https://twitter.com/your_username) - email@example.com

Project Link: [https://github.com/your_username/repo_name](https://github.com/your_username/repo_name)
https://github.com/abirbhattacharya82/Basic-Calculator/graphs/contributors

[contributors-shield]: https://img.shields.io/github/contributors/abirbhattacharya82/Basic-Calculator
[contributors-url]: https://github.com/abirbhattacharya82/Basic-Calculator/graphs/contributors
[forks-shield]: https://img.shields.io/github/forks/abirbhattacharya82/Basic-Calculator
[forks-url]: https://github.com/abirbhattacharya82/Basic-Calculator/network/members
[stars-shield]: https://img.shields.io/github/stars/abirbhattacharya82/Basic-Calculator
[stars-url]: https://github.com/abirbhattacharya82/Basic-Calculator/stargazers
[issues-shield]: https://img.shields.io/github/issues/abirbhattacharya82/Basic-Calculator
[issues-url]: https://github.com/abirbhattacharya82/Basic-Calculator/issues