Improve readme

Author: jerone

README.md

@@ -1 +1,16 @@
-# Jvw.DevToys.SemverCalculator
+# Jvw.DevToys.SemverCalculator
+
+A Semantic Versioning (SemVer) calculator for [DevToys](https://devtoys.app/) App.
+
+## License
+
+This extension is licensed under the MIT License - see the [LICENSE](https://github.com/jerone/Jvw.DevToys.SemverCalculator/blob/master/LICENSE.md) file for details.
+
+## Installation
+
+1. Download the `Jvw.DevToys.SemverCalculator` NuGet package from [NuGet.org](https://www.nuget.org/packages/Jvw.DevToys.SemverCalculator/).
+2. Open DevToys, go to `Manage extensions`, click on `Install an extension` and select the downloaded NuGet package.
+
+## Limitations
+
+Not support for DevToys CLI (for now).