Add setup documentation

SETUP.md

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+# OpenCode Space - 24/7 Keep-Alive Setup
+
+## Your Space URLs
+- **Web UI**: https://abbasyk60-opencode.static.hf.space
+- **Space Settings**: https://huggingface.co/spaces/abbasyk60/opencode
+
+## Static Spaces Don't Sleep!
+
+Good news: Your Space is a **Static Space**, which means:
+- It's served directly by HuggingFace's CDN
+- It does NOT have a runtime that can sleep
+- It's always available at the URL above
+
+The only way it would go down is if you delete it.
+
+## For Extra Safety: Set Up Free Monitoring
+
+### Option 1: UptimeRobot (Easiest - 2 minutes setup)
+
+1. Go to **https://uptimerobot.com**
+2. Sign up for free
+3. Click **"+ Add New Monitor"**
+4. Fill in:
+   - **Monitor Type**: HTTP(s)
+   - **Friendly Name**: OpenCode AI Agent
+   - **URL**: `https://abbasyk60-opencode.static.hf.space`
+   - **Monitoring Interval**: 5 minutes
+5. Click **Create Monitor**
+
+This will ping your Space every 5 minutes and email you if it's ever down.
+
+### Option 2: cron-job.org
+
+1. Go to **https://cron-job.org**
+2. Sign up for free
+3. Click **"Create Job"**
+4. Fill in:
+   - **URL**: `https://abbasyk60-opencode.static.hf.space`
+   - **Request Method**: GET
+   - **Schedule**: Every 5 minutes
+5. Save
+
+## Telegram Bot - Keep Running Locally
+
+The Telegram bot must run on your PC. To keep it running:
+
+### Option A: Run the batch file
+Double-click `start-bot.bat` in the project folder.
+
+### Option B: Run the PowerShell script
+```powershell
+.\keep-alive.ps1
+```
+
+### Option C: Windows Task Scheduler
+1. Open Task Scheduler
+2. Create Basic Task
+3. Trigger: Daily, repeat every 5 minutes
+4. Action: Start a program
+5. Program: `node`
+6. Arguments: `bot.js`
+7. Start in: `C:\Users\abbasyk\Documents\opencode-hf-space`