Add DEVELOP.md and update sn.txt

DEVELOP.md

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+# Development Guide
+
+## Environment requirements
+
+- Windows 10 (Linux or macOS might work too, not tested).
+- node v14.15.1 or higher.
+- yarn 1.22.10 or higher.
+
+## Install dependencies
+
+`yarn install`
+
+## Development and debugging
+
+`yarn serve`
+
+and the generators are stored in the `dist` directory.
+
+## Package Release
+
+- for Chrome: `yarn build:chrome`
+- for Firefox: `yarn build:firefox`
+
+and manufactured products are stored in the `artifacts` directory.

sn.txt

@@ -37,3 +37,24 @@ This extension can:
 
 Source code:
 https://github.com/liying2008/jenkins-helper
+
+
+==========================================================================================================
+单一用途说明
+Monitoring Jenkins build state and node state and helping Ops use Jenkins.
+
+
+需请求storage的理由
+Used to store this extension configuration information.
+
+需请求notifications的理由
+Notify Ops of build status and node status.
+
+需请求tabs的理由
+Determine if the current page is a Jenkins build page.
+
+需请求downloads的理由
+Download the Jenkins build log.
+
+需请求主机权限的理由
+Since Jenkins is an open source and self-deployable site, the extension cannot determine the URL of Jenkins used by the user.