Update README

Author: govert

README.md

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-# ImportFunctions
+# ImportFunctions
+
+ExcelDna.ImportFunctions is an Excel add-in that implements the IMPORTxxx functions from Google Sheets.
+The aim is to (eventually) be compatible with the behaviour of the Google Sheets functions.
+
+The initial functions are:
+* IMPORTXML
+* IMPORTHTML
+
+The add-in is developed in C# based on the Excel-DNA library, and uses the HtmlAgilityPack as a helper.
+
+The add-in targets .NET Framework 4.8 and Excel 2007 or later (Windows only).
+
+## Installation
+
+The Releases page on the GitHub repository contains the latest release, containng two files, ExcelDna.ImportFunctions32.xll and ExcelDna.ImportFunctions64.xll. Download the add-in matching installed Excel architecture, unblock the download and double-clicking to open in Excel. The add-in can also be installed in the Excel Add-Ins dialog (press Alt+t, i) to open automatically when Excel starts.
+
+**Remember to 'Unblock' the .xll file after downloading (by going to File -> Properties in Windows Explorer).**
+
+## Status
+
+The add-in is in early development, and is not yet ready for general use.
+
+## Support and Feedback
+
+Please create a GitHub Issue for any problems, questions or suggestions.
+
+## Building
+
+The project is built using Visual Studio 2022. The build process will download the required NuGet packages.
+
+## License
+
+The add-in is licensed under the MIT License. See the LICENSE file for details.
+
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