docs(ROADMAP): add ROADMAP.md file to document the current state of the project and the next steps.

ROADMAP.md

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+
+# CompareWare Roadmap
+
+## **Current Features**
+
+These features have been fully implemented:
+
+### **Autocompletion for Adding Items and Properties**
+- Integrated Wikidata's search API to provide autocompletion for item and property inputs.
+
+### **Fetching Basic Information**
+- Used Wikidata's REST API to fetch metadata for newly added items (e.g., description, tags).
+- Automatically populated these fields in the spreadsheet after adding an item.
+
+### **Wikidata Autocompletion**
+- Used Gloo's HTTP client to make calls to the Wikidata search API.
+
+### **App Component Updates**
+- Added a placeholder grid view using Leptos’ `view!` macro.
+- Rendered the comparison grid.
+- Added functionality to fetch items' properties dynamically from Wikidata.
+
+### **Enhance ItemForm**
+- Enabled searching for existing items via Wikidata.
+- Displayed fetched details in the form.
+
+---
+
+## **CompareWare: Next Steps**
+
+### **Immediate Steps**
+
+#### **Autocompletion for Adding Items and Properties:**
+- Fetch all properties for items from wikidata.
+- Autofill propertiy field with available properties for said item.
+- Add a fallback to redirect users to the Wikidata item creation page when a search fails.
+
+### **Authentication**
+- Enable authentication for users using Nsec.app.
+
+#### **Subjective Properties with Nostr Integration:**
+- Add a toggle for "objective" (Wikidata) vs. "subjective" (Nostr-backed) properties.
+- Store subjective properties locally first and publish them to a Nostr relay for decentralized edits.
+
+#### **Cache Mechanism:**
+- Use a lightweight database (e.g., SQLite or a key-value store like Redis) as a cache for frequently accessed items and properties.
+- Implement cache invalidation for edits to ensure the latest data is fetched.
+
+### **Advanced Features**
+
+#### **Advanced Filtering and Sorting:**
+- Add functionality to filter items by tags or properties.
+- Enable sorting by property values.
+
+#### **Item Suggestions:**
+- Based on properties and tags, suggest items for comparison.
+
+#### **Collaborative Comparison:**
+- Enable real-time collaboration with WebSockets, allowing users to view and edit comparisons together.
+
+#### **Export/Share Comparison:**
+- Add options to export the comparison as a CSV or share it via a unique link.