update readme

README.md

@@ -20,6 +20,24 @@ This repository obtains and reformats cards for the Leder Spotlight application.
 - `npm run build:i18n` - build the i18n files and ensure that they're formatted correctly
 - `npm run validate:card-data` - validate the card data is formatted correctly
 
+## Adding New Content
+
+### Products
+
+1. Create a new file matching the product name in `content/meta-data`
+1. Create a new folder in `content/card-data` (the name should match the `productName` in the `meta-data` file)
+1. Create a new folder in `content/card-images` (the name should match the `productName` in the `meta-data` file)
+1. Create a new folder in `content/card-symbols` (the name should match the `productName` in the `meta-data` file)
+
+Follow the guide for adding a new locale
+
+### Locale
+
+1. Create a new folder in `content/card-data/{product}` for the locale (probably `en-US`)
+   1. Add a `cards.yml` file here (or, as many separate files as desired - they all get concatenated together) and fill it with card data.
+1. Create a new folder in `content/card-images/{product}` for the locale (probably `en-US`)
+   1. Fill this folder with the images for the cards for the game.
+
 ## Publishing New Content
 
 This is done automatically when a PR is merged to `main`, and isn't intended to be done manually.