Revise contribution guidelines for clarity

Updated contributing guidelines to clarify the process for requesting and suggesting changes to platforms.

Author: CookieDuster

CONTRIBUTING.md

@@ -1,15 +1,23 @@
 # Contributing to the Commerce Comparison
 
-We welcome contributions! To keep the data clean, please follow these rules:
-
-### Adding a New Platform
-To add a platform (e.g., BigCommerce, Commercetools):
-1. Use the **45+ criteria** defined in the main README.
-2. Provide a source for pricing or technical specs where possible.
-3. Ensure the platform fits the "Commerce Platform" category.
-
-### Editing Existing Data
-If you notice an error in the Shopify, Crystallize, or Norce data:
-1. Fork this repository.
-2. Edit `data/comparison.csv`.
-3. Submit a Pull Request with a brief note on what changed (e.g., "Updated Shopify's AI capabilities").
+We welcome contributions! I welcome updates to existing platforms or the addition of new ones. To maintain the integrity of the data, please follow these steps:
+
+### 1. Requesting a New Platform
+If you want a platform covered but don't have all the data:
+* Open a **New Issue**.
+* Use the title `[Request]: Platform Name`.
+* The community or maintainers will help research the criteria.
+
+### 2. Suggesting Changes (The Pull Request Process)
+If you have the data and want to update the table directly:
+1. **Fork** this repository.
+2. Edit the `data/comparison.csv` file.
+3. **Requirement:** If adding a new platform, you **must** provide values for all 45+ criteria across our 5 categories:
+   * **Technical** (Architecture, API, etc.)
+   * **Features** (PIM, CMS, etc.)
+   * **AI** (Agentic Commerce, GenAI, etc.)
+   * **Pricing** (Fees, Entry costs, etc.)
+   * **Support** (SLAs, Training, etc.)
+4. Submit a **Pull Request** with the heading `feat: add [Platform Name]` or `fix: update [Platform Name] specs`.
+
+---