Cannot run .net ef even though tooling installed - xamarin

Question

I am trying to get ef core working within xamrian and I am having a few issues with the dotnet command not running. I have added the tools as per another so but that did not work.
This is my first migration and my conneciton stirng is set in the application.json of
"ConnectionStrings": {
"DefaultConnection": "Data Source=DEVELOPER\SAGESQL2014;Initial
Catalog=CallManagment;Integrated
Security=True;MultipleActiveResultSets=True" } }
This is the error I am getting thanks for the help.
dotnet ef migrations add InitialMigration dotnet : No executable found
matching command "dotnet-ef" At line:1 char:1
+ dotnet ef migrations add InitialMigration
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (No executable f...and "dotnet-ef":String) [], RemoteExcept ion
+ FullyQualifiedErrorId : NativeCommandErro
This is my project file at present
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>netcoreapp2.0</TargetFramework>
</PropertyGroup>
<ItemGroup>
<None Remove="appsettings.json" />
</ItemGroup>
<ItemGroup>
<Content Include="appsettings.json">
<CopyToPublishDirectory>PreserveNewest</CopyToPublishDirectory>
</Content>
</ItemGroup>
<ItemGroup>
<PackageReference Include="Microsoft.EntityFrameworkCore" Version="2.0.2" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="2.0.2" />
</ItemGroup>
<ItemGroup>
<Reference Include="System">
<HintPath>System</HintPath>
</Reference>
</ItemGroup>
</Project>
EDIT 2 TO show assembles added.
Edit 3
To Show changes made from below suggestion still not working.
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>netcoreapp2.0</TargetFramework>
</PropertyGroup>
<ItemGroup>
<None Remove="appsettings.json" />
</ItemGroup>
<ItemGroup>
<Content Include="appsettings.json">
<CopyToPublishDirectory>PreserveNewest</CopyToPublishDirectory>
</Content>
</ItemGroup>
<ItemGroup>
<PackageReference Include="Microsoft.EntityFrameworkCore" Version="2.0.2" />
<PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="2.0.2" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="2.0.2" />
</ItemGroup>
<ItemGroup>
<DotNetCliToolReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="2.0.2" />
</ItemGroup>
<ItemGroup>
<Reference Include="System">
<HintPath>System</HintPath>
</Reference>
</ItemGroup>
</Project>

Answer 1

Are you trying to run inside Package Manager Console? If so you'll need to cd to the project directory. Also, if you're inside PMC, why aren't you using the EF Core PMC tools?