Updated README.

Author: prochnowc

README.md

@@ -1,20 +1,59 @@
 AppCore .NET Signing Tool
 -------------------------
 
-<Build status>
+[![Build Status](https://dev.azure.com/AppCoreNet/SigningTool/_apis/build/status/AppCoreNet.SigningTool%20CI?branchName=dev)](https://dev.azure.com/AppCoreNet/SigningTool/_build/latest?definitionId=14&branchName=dev)
 
-<Project description>
+The AppCore .NET Signing Tool is a .NET CLI tool which can be used to sign assemblies.
 
-## Packages
+The motivation behind this project is to provide a cross-platform replacement of the 'sn' tool provided
+by the classic .NET Framework.
 
-Latest development packages can be found on [MyGet](https://www.myget.org/gallery/appcorenet).
+## Installation
 
-Package                                           | Description
---------------------------------------------------|------------------------------------------------------------------------------------------------------
+The tool is distributed as a [NuGet](https://nuget.org) package and can be easily installed by invoking the following
+command:
+
+```
+dotnet tool install -g AppCore.SigningTool
+```
+
+## Usage
+
+The tool can be invoked using the command `dotnet-signtool`. If you need help about available
+commands and options add `--help` to the command line.
+
+### Quickstart
+
+The easiest way to add strong-naming to your assemblies is by signing them directly during the build.
+
+First, create a key pair using the following command:
+
+```
+dotnet-signtool create-key my_key.snk
+```
+
+Next, edit your project file and add the following tags:
+
+```
+<PropertyGroup>
+  <SignAssembly>true</SignAssembly>
+  <AssemblyOriginatorKeyFile>my_key.snk</AssemblyOriginatorKeyFile>
+</PropertyGroup>
+```
+
+For more information please read the [Microsoft Docs](https://docs.microsoft.com/en-us/dotnet/standard/assembly/strong-named) about
+strong-named assemblies.
 
 ## Contributing
 
 Contributions, whether you file an issue, fix some bug or implement a new feature, are highly appreciated. The whole user community
 will benefit from them.
 
+If you want to try out the latest development version you can specify our [MyGet](https://www.myget.org/gallery/appcorenet)
+feed during installation:
+
+```
+dotnet tool install -g AppCore.SigningTool --add-source https://www.myget.org/F/appcorenet/api/v3/index.json
+```
+
 Please refer to the [Contribution guide](CONTRIBUTING.md).