Enhance PowerShell documentation (#386)

docs/PowerShell.md

@@ -1,10 +1,53 @@
 # ParquetSharp in PowerShell
 
-It's possible to use ParquetSharp from PowerShell.
-You can install ParquetSharp with the [NuGet command line interface](https://docs.microsoft.com/en-us/nuget/reference/nuget-exe-cli-reference),
-then use `Add-Type` to load `ParquetSharp.dll`.
-However, you must ensure that the appropriate `ParquetSharpNative.dll` for your architecture and OS can be loaded as required,
-either by putting it somewhere in your `PATH` or in the same directory as `ParquetSharp.dll`.
-For examples of how to use ParquetSharp from PowerShell,
-see [these scripts from Apteco](https://github.com/Apteco/HelperScripts/tree/master/scripts/parquet).
+The main requirement to using ParquetSharp from PowerShell is that `ParquetSharpNative.dll` is in the `PATH` or in the same directory as `ParquetSharp.dll`. The following guide shows one possible approach to achieve this:
+
+### Installation
+
+You can install ParquetSharp with the [NuGet command line interface](https://docs.microsoft.com/en-us/nuget/reference/nuget-exe-cli-reference).  
+
+First, make sure `nuget.exe` is in your `PATH`, or in the current directory, then run the following to install the latest version of ParquetSharp into a new directory called `lib`:
+
+```powershell
+nuget install ParquetSharp -OutputDirectory lib
+```
+
+Then, go into the `lib` directory and add the required `.dll` files to `bin`. The library versions may not necessarily match, so adjust them as necessary:
+
+```powershell
+New-Item -Name "bin" -ItemType Directory
+Copy-Item -Path ".\lib\System.Buffers.4.5.1\lib\net461\System.Buffers.dll" -Destination ".\bin"
+Copy-Item -Path ".\lib\System.Memory.4.5.4\lib\net461\System.Memory.dll" -Destination ".\bin"
+Copy-Item -Path ".\lib\System.Numerics.Vectors.4.5.0\lib\net46\System.Numerics.Vectors.dll" -Destination ".\bin"
+Copy-Item -Path ".\lib\System.Runtime.CompilerServices.Unsafe.4.5.3\lib\net461\System.Runtime.CompilerServices.Unsafe.dll" -Destination ".\bin"
+Copy-Item -Path ".\lib\System.ValueTuple.4.5.0\lib\net461\System.ValueTuple.dll" -Destination ".\bin"
+```
+
+Finally, copy `ParquetSharp.dll` and `ParquetSharpNative.dll` into `bin`. This will depend on the current version of ParquetSharp, as well as your architecture and OS:
 
+```powershell
+# Replace path with the appropriate version of ParquetSharp
+Copy-Item -Path ".\lib\ParquetSharp.12.1.0\lib\net461\ParquetSharp.dll" -Destination ".\bin"
+
+# Replace path with the appropriate version of ParquetSharp and architecture
+Copy-Item -Path ".\lib\ParquetSharp.12.1.0\runtimes\win-x64\native\ParquetSharpNative.dll" -Destination ".\bin"
+```
+
+The available runtime architectures are `win-x64`, `linux-x64`, `linux-arm64`, `osx-x64`, and `osx-arm64`.
+
+### Usage
+Use `Add-Type` to load `ParquetSharp.dll`. Note that we're using custom directories:
+
+```powershell
+# Replace path with the appropriate versions of ParquetSharp
+Add-Type -Path ".\lib\ParquetSharp.12.1.0\lib\net471\ParquetSharp.dll"
+```
+
+Now you can use ParquetSharp as usual:
+
+```powershell  
+$reader = New-Object -TypeName ParquetSharp.ParquetFileReader -ArgumentList "./data.parquet"
+```
+
+For more detailed examples of how to use ParquetSharp from PowerShell,
+see [these scripts from Apteco](https://github.com/Apteco/HelperScripts/tree/master/scripts/parquet).