Update dall-e readme

tools/dalle/README.md

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-# Dalle
+# DALL-E
+
+## Overview
+
+DALL-E is an AI image generator developed by OpenAI that generates images based on text prompts. Dify has integrated the DALL-E tool, and the following are the steps to configure and use the DALL-E tool in Dify.
+
+## Configure
+
+### 1. Apply for Dall-E API Key
+
+Please apply for an API Key on the OpenAI Platform.
+
+### 2. Get Dall-E tools from Plugin Marketplace
+
+The Dall-E tools could be found at the Plugin Marketplace, please install it first.
+
+### 3. Fill in the configuration in Dify
+
+On the Dify navigation page, click `Tools > DALL-E > Authorize` and fill in the API Key.
+
+**Note:** Base URL and Organization ID are optional. The Organization IDs can be found on your Organization settings page.
+
+![DALL-E Configuration](./_assets/dalle_1.PNG)
+
+### 4. Use the tool
+
+You can use the Dall-E tool in the following application types:
+
+#### Chatflow / Workflow applications
+
+![Chatflow/Workflow Application](./_assets/dalle_2.PNG)
+
+Both Chatflow and Workflow applications support the DALL-E tool node. After adding it, you need to fill in the "Input Variables → Prompt" in the node with variables to reference the user's input prompt or the content generated by the previous node. Finally, use the variable to reference the image output by DALL-E in the "End" node.
+
+#### Agent applications
+
+![Agent Application](./_assets/dalle_3.PNG)
+
+Add the Dall-E tool in the Agent application, then send a picture description in the dialog box to call the tool to generate an AI image.