docs(terraform): Add quick start guide

terraform/aws-infrastructure/docs/QUICKSTART.md

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+# 🚀 Quick Start Guide
+
+## 5-Minute Setup
+
+### Step 1: Clone Repository
+```bash
+git clone http://git.thedevops.dev/admin/k3s-gitops.git
+cd k3s-gitops/terraform/aws-infrastructure
+```
+
+### Step 2: Configure AWS
+```bash
+export AWS_ACCESS_KEY_ID="your-key"
+export AWS_SECRET_ACCESS_KEY="your-secret"
+export AWS_DEFAULT_REGION="us-east-1"
+```
+
+### Step 3: Create Configuration
+```bash
+cp environments/dev.tfvars terraform.tfvars
+vim terraform.tfvars
+```
+
+**Required variables:**
+```hcl
+project_name = "myapp"
+environment  = "dev"
+db_username  = "admin"
+db_password  = "SecurePassword123!"
+```
+
+### Step 4: Deploy
+```bash
+terraform init
+terraform plan
+terraform apply
+```
+
+**Deployment time:** 15-20 minutes  
+**Cost:** ~$50-100/month (dev)
+
+---
+
+## Post-Deployment
+
+### Get ALB DNS
+```bash
+terraform output alb_dns_name
+```
+
+### Test Application
+```bash
+curl http://$(terraform output -raw alb_dns_name)/health
+```
+
+### View All Outputs
+```bash
+terraform output
+terraform output -json > outputs.json
+```
+
+---
+
+## Common Tasks
+
+### Update Infrastructure
+```bash
+vim terraform.tfvars  # Make changes
+terraform plan
+terraform apply
+```
+
+### Scale Application
+```bash
+# Edit terraform.tfvars
+asg_desired_capacity = 5
+
+terraform apply
+```
+
+### View Logs
+```bash
+# CloudWatch Console
+open https://console.aws.amazon.com/cloudwatch
+
+# Or AWS CLI
+aws logs tail /aws/ec2/dev/system --follow
+```
+
+---
+
+## Cleanup
+
+### Development
+```bash
+terraform destroy -var-file="environments/dev.tfvars"
+```
+
+### Production (⚠️ Dangerous)
+```bash
+# Create backup first!
+terraform destroy -var-file="environments/production.tfvars"
+```
+
+---
+
+## Troubleshooting
+
+**Issue:** "Error creating VPC"  
+**Solution:** Check AWS limits
+
+**Issue:** "Insufficient permissions"  
+**Solution:** Ensure IAM user has required permissions
+
+**Issue:** "State lock timeout"  
+**Solution:** `terraform force-unlock <LOCK_ID>`
+
+---
+
+## Next Steps
+
+1. Read [README.md](../README.md)
+2. Review security best practices
+3. Setup CI/CD pipeline
+4. Configure monitoring
+
+---
+
+## Getting Help
+
+- Issues: http://git.thedevops.dev/admin/k3s-gitops/issues
+- Slack: #infrastructure
+- Email: devops@example.com