Update CHANGELOG.md

Author: georgekutty-1

CHANGELOG.md

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-# Changelog
+# Changelog
+
+
+## [v1.0.0](https://github.com/instana/instana-go-client/releases/tag/v1.0.0) - 2026-04-14
+
+### Added
+
+#### API Resource Support
+- **Alerting Channels**: Email, Slack, PagerDuty, Webhook, and more
+- **Alerting Configurations**: Alert rule management
+- **API Tokens**: Token lifecycle management
+- **Application Alerts**: Application-level alert configurations
+- **Application Configs**: Application monitoring configuration
+- **Automation Actions**: Automated response actions
+- **Automation Policies**: Policy-based automation rules
+- **Built-in Event Specs**: Pre-defined event specifications
+- **Custom Dashboards**: Dashboard creation and management
+- **Custom Event Specs**: Custom event definitions
+- **Groups**: RBAC group management
+- **Host Agents**: Agent discovery and management
+- **Infrastructure Alerts**: Infrastructure monitoring alerts
+- **Log Alerts**: Log-based alerting
+- **Maintenance Windows**: Scheduled maintenance configuration
+- **Mobile Alerts**: Mobile app alert configurations
+- **Mobile App Configs**: Mobile application monitoring
+- **Roles**: RBAC role management
+- **SLI Configs**: Service Level Indicator configurations
+- **SLO Alerts**: Service Level Objective alerting
+- **SLO Configs**: SLO definition and management
+- **SLO Corrections**: SLO correction windows
+- **Synthetic Alerts**: Synthetic monitoring alerts
+- **Synthetic Locations**: Synthetic test location management
+- **Synthetic Tests**: Synthetic test configuration
+- **Teams**: Team management for RBAC
+- **Users**: User account management
+- **Website Alerts**: Website monitoring alerts
+- **Website Monitoring**: Website monitoring configuration