chore(docs): update readme(add budges, install, license, example)

README.md

@@ -1 +1,37 @@
 # AWS Log Stream Event Notification Stack
+
+[![GitHub](https://img.shields.io/github/license/gammarers/aws-log-stream-event-notification-stack?style=flat-square)](https://github.com/gammarers/aws-log-stream-event-notification-stack/blob/main/LICENSE)
+[![npm (scoped)](https://img.shields.io/npm/v/@gammarers/aws-log-stream-event-notification-stack?style=flat-square)](https://www.npmjs.com/package/@gammarers/aws-log-stream-event-notification-stack)
+[![GitHub Workflow Status (branch)](https://img.shields.io/github/actions/workflow/status/gammarers/aws-log-stream-event-notification-stack/release.yml?branch=main&label=release&style=flat-square)](https://github.com/gammarers/aws-log-stream-event-notification-stack/actions/workflows/release.yml)
+[![GitHub release (latest SemVer)](https://img.shields.io/github/v/release/gammarers/aws-log-stream-event-notification-stack?sort=semver&style=flat-square)](https://github.com/gammarers/aws-log-stream-event-notification-stack/releases)
+
+This AWS CDK construct stack subscribes to a CloudWatch Logs log stream, and when a target log level is detected, it sends the log information to a Step Functions state machine via a Lambda function. The state machine processes and formats the log information, then publishes a message to the target SNS topic.
+
+## Install
+
+### TypeScript
+
+#### install by npm
+
+```shell
+npm install @gammarers/aws-log-stream-event-notification-stack
+```
+
+#### install by yarn
+
+```shell
+yarn add @gammarers/aws-log-stream-event-notification-stack
+```
+
+## Example
+
+```typescript
+import { LogStreamEventNotificationStack } from '@gammarers/aws-log-stream-event-notification-stack';
+
+new LogStreamEventNotificationStack(app, 'LogStreamEventNotificationStack');
+
+```
+
+## License
+
+This project is licensed under the Apache-2.0 License.