Add NuGet.Server migration guide (loic-sharma#326)

docs/tools/migrate.md

@@ -0,0 +1,39 @@
+# Migrate from NuGet.Server
+
+[NuGet.Server](https://github.com/NuGet/NuGet.Server) is a lightweight standalone NuGet server. It is strongly recommended that you upgrade to BaGet if you use NuGet.Server. Feel free to open a [GitHub issue](https://github.com/loic-sharma/BaGet/issues) if you need help migrating.
+
+!!! info
+    Please refer to the [BaGet vs NuGet.Server](../vs/nugetserver.md) page for reasons to upgrade to BaGet.
+
+# Steps
+
+Make sure that you've installed [nuget.exe](https://www.nuget.org/downloads). In PowerShell, run:
+
+```ps1
+$source = "<NuGet.Server package source>"
+$destination = "<BaGet package source>"
+```
+
+If you've [configured BaGet to require an API Key](https://loic-sharma.github.io/BaGet/configuration/#requiring-an-api-key), set it using [the `setapikey` command](https://docs.microsoft.com/en-us/nuget/reference/cli-reference/cli-ref-setapikey):
+
+```ps1
+& nuget.exe setapikey "NUGET-SERVER-API-KEY" -Source $destination
+```
+
+Now run the following PowerShell script:
+
+```ps1
+if (!(Test-Path "Web.config")) {
+  throw "Please run this script in the same directory as NuGet.Server's Web.config file"
+}
+
+(& nuget.exe list -AllVersions -Source $source).Split([Environment]::NewLine) | % {
+  $id = $_.Split(" ")[0].Trim()
+  $version = $_.Split(" ")[1].Trim()
+
+  $path = [IO.Path]::Combine("Packages", $id, $version, "${id}.${version}.nupkg")
+
+  Write-Host "nuget.exe push -Source $destination ""$path"""
+  & nuget.exe push -Source $destination $path
+}
+```

docs/vs/nugetserver.md

@@ -16,6 +16,6 @@
     * Cross-platform
     * Supports NuGet v3 APIs
 
-## Upgrade Guide
+## Migration Guide
 
-TODO
+You can use the [NuGet.Server migration](../tools/migrate.md) guide to import your NuGet.Server packages into BaGet.

mkdocs.yml

@@ -45,6 +45,7 @@ pages:
   - Tools:
     - Mirroring: tools/mirroring.md
     - BaGet SDK: tools/sdk.md
+    - Migrate from NuGet.Server: tools/migrate.md
   - BaGet vs. Other:
     - nuget.org: vs/nugetorg.md
     - NuGet.Server: vs/nugetserver.md