feat:add docs

docs/guide/command-get.md

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+# 获取数据命令
+
+## 使用方式
+
+```javascript
+import Editor from "@hufe921/canvas-editor"
+
+const instance = new Editor(container, <IElement[]>data, options)
+const value = instance.command.commandName()
+```
+## getValue
+功能：获取当前文档信息
+
+用法：
+```javascript
+const {
+  version: string;
+  width: number;
+  height: number;
+  margins: IMargin;
+  header?: IHeader;
+  watermark?: IWatermark;
+  data: IElement[];
+} = instance.command.getValue()
+```
+
+## getImage
+功能：获取当前页面图片base64字符串
+
+用法：
+```javascript
+const base64StringList = instance.command.getValue()
+```
+
+## getWordCount
+功能：获取文档字数
+
+用法：
+```javascript
+const wordCount = await instance.command.getWordCount()
+```
+## getRangeText
+功能：获取选区文本
+
+用法：
+```javascript
+const rangeText = instance.command.getRangeText()
+```
+
+## getPaperMargin
+功能：获取页边距
+
+用法：
+```javascript
+const [top: number, right: number, bottom: number, left: number] = instance.command.getPaperMargin()
+```
+
+## getSearchNavigateInfo
+功能：获取搜索导航信息
+
+用法：
+```javascript
+const {
+  index: number;
+  count: number;
+} = instance.command.getSearchNavigateInfo()
+```