FEAT: add TypedPseudoDocument

REFACTOR: PreudoDocument
FIX: Typos Bug

module/data/pseudo-documents/feature/baseFeatureData.mjs

@@ -0,0 +1,25 @@
+import PseudoDocument from '../base/pseudoDocument.mjs';
+
+export default class BaseFeatureData extends PseudoDocument {
+    /**@inheritdoc */
+    static get metadata() {
+        return foundry.utils.mergeObject(
+            super.metadata,
+            {
+                name: 'feature',
+                label: 'DAGGERHEART.Feature.Label',
+                embedded: {},
+                sheetClass: null //TODO: define feature-sheet
+            },
+            { inplace: false }
+        );
+    }
+
+    static defineSchema() {
+        const { fields } = foundry.data;
+        const schema = super.defineSchema();
+        return Object.assign(schema, {
+            subtype: new fields.StringField({ initial: 'test' })
+        });
+    }
+}