fix: Set KubeOps.Generator as a DevelopmentDependency (#834)

Fixes: #698 
This will cause `dotnet add package` to add this to the PackageReference
automatically:
```
<PrivateAssets>all</PrivateAssets>
<IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
```

Author: gamingrobot

src/KubeOps.Generator/KubeOps.Generator.csproj

@@ -1,10 +1,11 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
         <TargetFramework>netstandard2.0</TargetFramework>
         <EnforceExtendedAnalyzerRules>true</EnforceExtendedAnalyzerRules>
         <IsRoslynComponent>true</IsRoslynComponent>
         <GenerateDocumentationFile>false</GenerateDocumentationFile>
+        <DevelopmentDependency>true</DevelopmentDependency>
     </PropertyGroup>
 
     <PropertyGroup>

src/KubeOps.Generator/README.md

@@ -16,7 +16,10 @@ which results in the following `csproj` reference:
 
 ```xml
 <ItemGroup>
-    <PackageReference Include="KubeOps.Generator" Version="..." />
+    <PackageReference Include="KubeOps.Generator" Version="...">
+        <PrivateAssets>all</PrivateAssets>
+        <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
+    </PackageReference>
 </ItemGroup>
 ```