added s5cmd doc

Storage/S5CMD/main.md

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+# 📘 S5CMD Reference Guide
+
+`s5cmd` is a fast and efficient S3 and local filesystem command-line tool optimized for large-scale data operations.
+
+---
+
+## 🔹 Command Syntax
+
+```bash
+s5cmd [global options] <command> [command options] [arguments...]
+```
+
+---
+
+## ⚙️ Global Options
+
+| Option                  | Description                                    |
+| ----------------------- | ---------------------------------------------- |
+| `--aws-profile string`  | AWS profile to use                             |
+| `--endpoint-url string` | Custom S3 endpoint                             |
+| `--no-sign-request`     | Do not sign requests (for public buckets)      |
+| `--numworkers int`      | Number of parallel workers (**default: 256**)  |
+| `--retry-count int`     | Number of retries for failed requests          |
+| `--json`                | Output logs in JSON format                     |
+| `--log string`          | Log level: `info`, `warning`, `error`, `debug` |
+| `--dry-run`             | Show operations without executing              |
+
+---
+
+## 📂 Common Commands
+
+### 🔍 List Buckets/Objects
+
+```bash
+s5cmd ls s3://bucket_2/
+```
+
+### 🪣 Bucket Management
+
+```bash
+s5cmd mb s3://new-bucket       # Create bucket
+s5cmd rb s3://bucket-name      # Remove bucket
+```
+
+### 📤 Upload Files
+
+```bash
+s5cmd cp local.txt s3://bucket/file.txt
+```
+
+### 📥 Download Files
+
+```bash
+s5cmd cp s3://bucket/file.txt ./local.txt
+s5cmd cp s3://bucket/*.jpg ./photos/
+```
+
+### 🔀 Move/Rename Files
+
+```bash
+s5cmd mv s3://bucket/old.txt s3://bucket/new.txt
+```
+
+### 🗑️ Remove Files
+
+```bash
+s5cmd rm s3://bucket/file.txt
+s5cmd rm --all-versions s3://bucket/file.txt
+```
+
+### 🔄 Synchronization
+
+```bash
+s5cmd sync ./localdir/ s3://bucket/targetdir/
+s5cmd sync s3://bucket/targetdir/ ./localdir/
+```
+
+### 📖 Read File Content
+
+```bash
+s5cmd cat s3://bucket/file.txt
+```
+
+### 📊 Disk Usage
+
+```bash
+s5cmd du s3://bucket/*
+```
+
+### 🔎 Query with S3 Select
+
+```bash
+s5cmd select "select * from s3object s limit 10" s3://bucket/data.csv
+```