Created nodejs with SeaweedFS (markdown)

nodejs-with-SeaweedFS.md

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+### Requirements & features
+- Use `node@12.0.0+`
+- Code with `javascript` or `typescript`
+- Seaweedfs with `-s3` running at `:8333`
+
+### Installation
+Install [AWS S3 client](https://www.npmjs.com/package/@aws-sdk/client-s3)
+```bash
+npm i @aws-sdk/client-s3
+```
+
+### Client initialization
+```javascript
+import { S3Client } from "@aws-sdk/client-s3"
+
+const s3client = new S3Client({
+  // specify endpoint with http://hostname:port
+  endpoint: `http://127.0.0.1:8333`,
+  // specify region since it is mandatory, but it will be ignored by seaweedfs
+  region: `us-east-1`, 
+  // force path style for compatibility reasons
+  forcePathStyle: true,
+  // credentials should be provided if you enabled them with `s3.configure`, otherwise client will be treated as anonymous
+  credentials: {
+    accessKeyId: `same as -accesskey`,
+    secretAccessKey: `same as -secretkey`,
+  }
+})
+```
+
+### Execute commands
+
+```javascript
+// List buckets example
+import { ListBucketsCommand } from "@aws-sdk/client-s3"
+const response = await s3client.send(new ListBucketsCommand({}))
+console.log(response.Buckets)
+```
+More commands: [API Reference](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/clients/client-s3/index.html)
+