Add Ralph skill for autonomous PRD creation and implementation

skills/ralph/templates/prd-template.json

@@ -0,0 +1,19 @@
+{
+  "projectName": "feature-name",
+  "branchName": "ralph/feature-name",
+  "description": "Descriere scurtă a feature-ului",
+  "userStories": [
+    {
+      "id": "US-001",
+      "title": "Titlu story",
+      "description": "As a [user type], I want [feature] so that [benefit]",
+      "priority": 1,
+      "acceptanceCriteria": [
+        "Criteriu specific și verificabil",
+        "npm run typecheck passes"
+      ],
+      "passes": false,
+      "notes": ""
+    }
+  ]
+}