Feat: add readme

Author: cpa-coder

README.md

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+<img alt="" src="./assets/header.svg">
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+---
+
+## About
+
+VAT Relief Generator is an open source windows application to simplify the process of generating [BIR](https://www.bir.gov.ph/index.php/home.html) VAT relief files in the Philippines.
+
+## Features
+* Maximize the use of your existing Excel skills to simply data encoding using pre-defined templates
+* Use drag and drop to easily import your data
+* One-click generation of VAT relief files
+
+## Usage
+1. Download the latest stable release from the release page.
+2. Download a excel template directly from the application or from [here](https://github.com/cpa-coder/vat-relief/blob/main/DebitExpress.VatRelief/template.xltx).
+3. Fill in the data in the template. Make sure to read the instruction carefully to properly fill-out the downloaded template.
+4. Drag and drop the template to the application.
+5. Click the generate button to generate the VAT relief files.
+6. The generated files will be saved in the same directory as the template.
+7. Validate the generated files using the [BIR Relief v2.3](https://www.bir.gov.ph/index.php/downloadables.html#relief) which includes validation tool.
+
+## License
+VAT Relief Generator is licensed under the [MIT License](https://github.com/cpa-coder/vat-relief/blob/main/LICENSE).
+
+## Dependencies
+
+Thank you :gift_heart: to the following projects for making VAT Relief Generator possible:
+
+* [Microsoft .NET](https://dotnet.microsoft.com/en-us/)
+* [Material Design In XAML Toolkit](https://github.com/MaterialDesignInXAML/MaterialDesignInXamlToolkit)
+* [ClosedXML](https://github.com/ClosedXML/ClosedXML)
+
+## Disclaimer
+
+VAT Relief Generator is not affiliated with the Bureau of Internal Revenue (BIR) of the Philippines. The application is not endorsed by the BIR and is not an official BIR application. The application is provided as-is without any warranty. The author is not responsible for any damages caused by the use of the application.