📝 add readme

Author: antoinekm

README.md

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+# Symfony React Blank
+Symfony React Blank is a blank symfony and react project, use this template to start your app using Symfony as an backend api and React as a frontend library.
+
+## Installation
+* [Install Composer](https://getcomposer.org/download).
+* [Install Yarn](https://yarnpkg.com/) or [NodeJS](https://nodejs.org/).
+* Click on "use this template" button on the top of this repository and run the following commands:
+
+```
+# Clone the project to download its contents
+> cd projects/
+> git clone <your repository link>.git
+or
+> git clone https://github.com/AntoineKM/symfony-react-blank.git
+
+# Make Composer install the project's dependencies into vendor/
+# Warning: This template requires php >=8.0.0
+> cd <your project name>
+or
+> cd symfony-react-blank
+> composer install
+
+# Make Yarn install the project's dependencies into node_modules/
+> yarn install
+
+```
+
+* Finally, setup your ``.env.local`` as the [.env](.env)
+
+## Usage
+```
+# Startup the Symfony server
+> symfony server:start
+
+# Then startup the Symfony Encore server
+> yarn dev-server
+```
+
+* Access the server at http://localhost:8000