Initial release

Initial Release for GoMailer Library 🥳

I am excited to announce the initial release of the GoMailer Library! This library provides a robust and flexible way to send emails in Go, with support for various features and configurations.

Features

• Plain Text and HTML Emails: Send emails with plain text, HTML content, or both (multipart/alternative).
• Attachments: Attach files to your emails with base64 encoding.
• Custom Headers: Add custom headers to your email messages.
• Multiple Recipients: Support for To, Cc, and Bcc recipients.
• Authentication Mechanisms: Support for various authentication methods, including CRAM-MD5.
• TLS Configurations: Configure TLS settings for secure email transmission.