add dalle plugin

plugins/dalle/README.md

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+# Dalle3
+
+> openai's dall-e image generator.
+
+## Schema
+[openapi.json](./openapi.json)
+
+## Servers
+
+`https://api.openai.com`
+
+## Operations
+
+1. Dalle3;
+
+## Authentication
+
+type: bearer
+location: header
+
+## Preview
+
+![Preview](./preview.png)
+
+

plugins/dalle/openapi.json

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+{
+  "openapi": "3.1.0",
+  "info": {
+    "title": "Dalle3",
+    "version": "1.0.0"
+  },
+  "servers": [
+    {
+      "url": "https://api.openai.com"
+    }
+  ],
+  "paths": {
+    "/v1/images/generations": {
+      "post": {
+        "operationId": "Dalle3",
+        "x-openai-isConsequential": false,
+        "summary": "openai's dall-e image generator.",
+        "requestBody": {
+          "required": true,
+          "content": {
+            "application/json": {
+              "schema": {
+                "type": "object",
+                "required": ["model", "n", "prompt", "size", "quality", "style"],
+                "properties": {
+                  "model": {
+                    "type": "string",
+                    "description": "model name, required and value is `dall-e-3`."
+                  },
+                  "n": {
+                    "type": "number",
+                    "description": "value is `1`"
+                  },
+                  "prompt": {
+                    "type": "string",
+                    "description": "A text description of the desired image(s). input must be a english prompt."
+                  },
+                  "size": {
+                    "type": "string",
+                    "description": "images size, can be `1024x1024`, `1024x1792`, `1792x1024`. default value is `1024x1024`"
+                  },
+                  "quality": {
+                    "type": "string",
+                    "description": "images quality, can be `standard`, `hd`. default value is `hd`"
+                  },
+                  "style": {
+                    "type": "string",
+                    "description": "images style, can be `vivid`, `natural`. default value is `vivid`"
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+}