added Readme

ReadMe.md

@@ -0,0 +1,59 @@
+# MailService
+
+## Overview
+
+MailService is a simple C# console application that demonstrates how to send plain text and HTML emails using SMTP settings defined in a configuration file. The application reads SMTP settings from a JSON file (`appsettings.json`), and uses these settings to send emails through an `SmtpClient`.
+
+## Features
+
+- Send plain text emails.
+- Send HTML emails using an HTML template file.
+- Replace placeholders in the HTML template with actual values.
+
+## Project Structure
+
+- `Program.cs`: The main entry point of the application. It reads the SMTP settings from `appsettings.json`, initializes the `MailService`, and sends both plain text and HTML emails.
+- `SmtpSettings.cs`: A class that holds the SMTP configuration settings.
+- `MailService.cs`: A class that handles the logic for sending emails.
+- `appsettings.json`: A JSON file that contains the SMTP configuration settings.
+- `email.html`: An HTML template file used for sending HTML emails.
+
+## Configuration
+
+The SMTP settings are stored in the `appsettings.json` file. Here is an example configuration:
+
+```json
+{
+  "smtpServer": "smtp.office365.com",
+  "smtpPort": 587,
+  "smtpUser": "user",
+  "smtpPassword": "smtpPassword",
+  "smtpFrom": "smpt@service.com"
+}
+```
+
+## Usage
+
+1. Clone the repository and navigate to the project directory.
+2. Ensure the `appsettings.json` file is correctly configured with your SMTP settings.
+3. Run the application using your preferred IDE or the .NET CLI.
+
+### Sending Emails
+
+The application sends two types of emails:
+
+1. **Plain Text Email**:
+   - Sent using the `SendEmailText` method in `MailService`.
+   - Example: `await mailService.SendEmailText("user@user.com", "Hello World", "Hello World from C#!");`
+
+2. **HTML Email**:
+   - Sent using the `SendEmailHtmlFile` method in `MailService`.
+   - The method searches for placeholders in the format `{keyValue}` within the HTML template and replaces them with the corresponding values from the provided dictionary.
+   - Example:
+     ```csharp
+     Dictionary<string, string> replacements = new Dictionary<string, string>
+     {
+         { "name", "Jonas" }
+     };
+     await mailService.SendEmailHtmlFile("user@user.com", "Hello World", "email.html", replacements);
+     ```