add README for schemas

resources/schemas/README.md

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+# Victory Card Schemas
+
+These schemas define how *Victory!* cards should be represented in JSON for interaction with the [cards database API](../../create/).
+
+
+<br>
+
+
+## Casing
+
+Particular casing styles are used for different attributes.
+
+| key nature | case | instance | notes |
+| :--------- | :--- | :------- | :---- |
+| in-game properties | `Single` | `Power` `Materials` | Capitalised for visual distinction from other JSON Schema keys. |
+| enum values | `KEBAB-CAPS` | `CYBERNETIC` `UPGRADE` | Fully capitalised for consistency while retaining visual distinction from other values. |