Create CONTRIBUTING.md

Author: JefteCaro

CONTRIBUTING.md

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+# Contributing
+
+Thanks for your interest in contributing to `react-tailwindcss-datepicker`! Please take a moment to review this document **before submitting a pull request**.
+
+- [Pull requests](#pull-requests)
+- [Installation](#installation)
+- [Coding standards](#coding-standards)
+- [Running playground](#running-playgrounds)
+- [Before you make a Pull Request](#before-you-make-a-pull-request)
+
+## Pull requests
+
+**Please ask first before starting work on any significant new features.**
+
+It's never a fun experience to have your pull request declined after investing a lot of time and effort into a new feature. To avoid this from happening, we request that contributors create [an issue](https://github.com/onesine/react-tailwindcss-datepicker/issues) to first discuss any significant new features.
+
+## Installation
+
+You only require a `yarn install` in the root directory to install everything you need.
+
+```sh
+yarn install
+```
+
+## Coding standards
+
+We use `prettier` for making sure that the codebase is formatted consistently.
+To automatically fix any style violations in your code, you can run:
+
+**Using yarn**
+
+```sh
+yarn pret:fix
+```
+
+**Using npm**
+
+```sh
+npm pret:fix
+```
+
+## Running playground
+
+We currently use `next.js` as server for live testing.
+
+You can run the `dev` script and open your browser to `http://localhost:8888`.
+
+See complete `props` usage in `pages/index.js` file.
+
+**Using yarn**
+
+```sh
+yarn dev
+```
+
+**Using npm**
+
+```sh
+npm dev
+```
+
+## Before you make a Pull Request
+
+We recommend to run these scripts in sequence before you make your commit message amd open a Pull Request
+
+**Let's clean the code first**
+```sh
+yarn pret:fix
+```
+
+**Test a build of your changes**
+```sh
+yarn build
+
+```
+