Make Unity test setup script runnable in *nix.

Author: yfakariya

test/MsgPack.UnitTest.Unity.Il2cpp.Full.Desktop/MakeAssets.ps1

@@ -17,11 +17,11 @@ foreach($c in $csproj.Project.ItemGroup.Compile)
 
     if ($c.Link -ne $null)
     {
-        $destination = "Assets/UnitTests/$($c.Link)"
+        $destination = "Assets/UnitTests/$($c.Link)".Replace("\", "/")
     }
     else
     {
-        $destination = "Assets/UnitTests/$($c.Include)"
+        $destination = "Assets/UnitTests/$($c.Include)".Replace("\", "/")
     }
 
     $destinationDirectory = [IO.Path]::GetDirectoryName($destination);

test/MsgPack.UnitTest.Unity.Il2cpp.Full/Readme.md

@@ -9,7 +9,15 @@ How to build
 ---
 
 1. Go to `../MsgPack.UnitTest.Unity.Il2cpp.Full.Desktop` directory.
-2. Run `MakeAssets.ps1` PowerShell script (it may work on PowerShell Core)
+2. Run `MakeAssets.ps1` PowerShell script.
+```
+@rem In Windows
+powershell -ExecutionPolicy Unrestricted ./MakeAssets.ps1
+```
+```
+# In *nix
+pwsh ./MakeAssets.ps1
+```
 3. Ensure `../MsgPack.UnitTest.Unity.Il2cpp.Full.Desktop/Assets` directory and its subtree have been generated.
 4. Open this folder with Unity.
 5. Import `../MsgPack.UnitTest.Unity.Il2cpp.Full.Desktop/Assets/Dll` directory into `Assets` of Unity project with Unity Editor.