Make the tool package nicer

[baronfel]

This adds

• license link
• package type
• better description
• release notes
• icon
• readme

to the generated package.

Found a paket bug so the readme part doesn't work, but it also doesn't break anything so we can add it now and be ready for when paket updates. I logged the paket issue, submitted a fix, and verified that fix with this repo so it should be all fine.

EDIT: updated paket with the fix and all is good now.

[baronfel]

Here's the new generated nuspec after this:

<?xml version="1.0" encoding="utf-8"?>
<package xmlns="http://schemas.microsoft.com/packaging/2013/05/nuspec.xsd">
  <metadata>
    <id>fsautocomplete</id>
    <version>0.46.2</version>
    <title>FsAutoComplete</title>
    <authors>FsAutoComplete contributors</authors>
    <requireLicenseAcceptance>false</requireLicenseAcceptance>
    <license type="expression">Apache-2.0</license>
    <licenseUrl>https://licenses.nuget.org/Apache-2.0</licenseUrl>
    <icon>logo.png</icon>
    <description>A community-developed Language Server Protocol implementation for F#</description>
    <releaseNotes>BUGFIX: fix the dotnet tool packaging to include a missing dependency for code formatting
BUGFIX: [fix indentation and insert position for unopened namespaces](https://github.com/fsharp/FsAutoComplete/pull/788) (Thanks @Booksbaum)
ENHANCEMENT: [Render parameters that are functions with parens for readability](https://github.com/fsharp/FsAutoComplete/pull/785)</releaseNotes>
    <readme>README.md</readme>
    <packageTypes>
      <packageType name="DotnetTool" />
    </packageTypes>
    <repository type="git" url="https://github.com/baronfel/fsautocomplete" commit="9bd0ea012588f41eec47390b79f6d654abf7af15" />
    <contentFiles>
      <files include="any/net5.0/default.win32manifest" buildAction="Content" />
    </contentFiles>
  </metadata>
</package>

which looks quite nice as a base to me. the logo and readme are added to the package root.