Add README file (#185)

- Add README file
- Fix License Expressions

#182 non-breaking

Directory.Build.props

@@ -1,11 +1,10 @@
-
 <Project>
  <PropertyGroup>
    <Authors>thiery</Authors>
    <Description>.NET implementation of the LEGO PoweredUp Protocol</Description>
    <PackageTags>lego, poweredup, powered, up, controlplus, csharp, dotnet, technic, techniccontrolplus, legocontrolplus, legotechniccontrolplus, legopoweredup</PackageTags>
    <PackageProjectUrl>https://github.com/sharpbrick/powered-up</PackageProjectUrl>
    <RepositoryUrl>https://github.com/sharpbrick/powered-up</RepositoryUrl>
-   <PackageLicense>MIT</PackageLicense>
+   <PackageLicenseExpression>MIT</PackageLicenseExpression>
  </PropertyGroup>
 </Project>

src/SharpBrick.PoweredUp/SharpBrick.PoweredUp.csproj

@@ -5,10 +5,18 @@
     <LangVersion>10.0</LangVersion>
   </PropertyGroup>
 
+  <PropertyGroup>
+    <PackageReadmeFile>README.md</PackageReadmeFile>
+    </PropertyGroup>
+
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="8.0.0" />
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="8.0.0" />
     <PackageReference Include="System.Reactive" Version="6.0.0" />
   </ItemGroup>
 
+  <ItemGroup>
+    <None Include="..\..\README.md" Pack="true" PackagePath=""/>
+  </ItemGroup>
+
 </Project>