Added small reminder note about how to bundle translations for release

Author: Ryochan7

doc/dev/bundle_translations.md

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+## Bundle Translations
+
+### Edit Project File Post-Build
+
+Open the DS4WindowsWPF.csproj file. Navigate to the Post-Build section.
+Add two `:` characters before the `GOTO END` statement to comment the line out.
+Build the program in Visual Studio or directly with MSBuild. The dedicated Lang folder
+will be created with the compiled translation assemblies
+
+#### Add new Translations in project file
+
+Edit the `langs` variable in the Post-Build step with the .NET culture code for a
+locale.
+
+### Add Lang folder loading
+
+.NET normally expects translation assemblies to be bundled in folders
+for each locale directly next to the running executable. Since DS4Windows
+uses a Lang subfolder, an extra step must be performed to make sure .NET will
+find the compiled assemblies.
+
+A Python 3 (3.10) script is included in the solution `utils` folder (`inject_deps_path.py`).
+It accepts the path to the relevant `DS4Windows.deps.json` file as a cmd argument. The script
+will add necessary path variable for the project entry to include an extra include path
+for the .NET Runtime.