Add README file to Go and PHP backend tutorials

basic/backend/go/README.md

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+# Basic Backend Node
+
+Basic server application built for Go with Gin. It internally uses [livekit-server-sdk-go](https://pkg.go.dev/github.com/livekit/server-sdk-go).
+
+For further information, check the [tutorial documentation](https://livekit-tutorials.openvidu.io/basic/backend/go).
+
+## Prerequisites
+
+-   [Go](https://go.dev/dl/)
+
+## Run
+
+1. Download repository
+
+```bash
+git clone https://github.com/OpenVidu/openvidu-livekit-tutorials.git
+cd openvidu-livekit-tutorials/basic/backend/go
+```
+
+2. Run the application
+
+```bash
+go run main.go
+```

basic/backend/php/README.md

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+# Basic Backend Node
+
+Basic server application built for PHP. It internally uses [livekit-server-sdk-php](https://github.com/agence104/livekit-server-sdk-php).
+
+For further information, check the [tutorial documentation](https://livekit-tutorials.openvidu.io/basic/backend/php).
+
+## Prerequisites
+
+-   [PHP](https://www.php.net/downloads)
+-   [Composer](https://getcomposer.org/download/)
+
+## Run
+
+1. Download repository
+
+```bash
+git clone https://github.com/OpenVidu/openvidu-livekit-tutorials.git
+cd openvidu-livekit-tutorials/basic/backend/php
+```
+
+2. Install dependencies
+
+```bash
+composer install
+```
+
+3. Run the application
+
+```bash
+composer start
+```