updated instructions to find the json file docs

Author: rajbos

.github/copilot-instructions.md

@@ -40,7 +40,8 @@ The entire extension's logic is contained within the `CopilotTokenTracker` class
   - `CopilotTokenTracker`: The main class.
   - `calculateDetailedStats()`: The primary data aggregation method.
   - `getDetailsHtml()`: The method responsible for rendering the webview's HTML content. All styling is inlined within this method's template string.
-- **`src/tokenEstimators.json`**: Character-to-token ratio estimators for different AI models. To add or modify token estimation for a model, update this file.
-- **`src/modelPricing.json`**: Model pricing data with input/output costs per million tokens. Includes metadata about pricing sources and last update date. To update pricing, modify this file.
+- **`src/README.md`**: **IMPORTANT**: Contains detailed instructions for updating the JSON data files. Always consult this file when updating tokenEstimators.json or modelPricing.json. It includes structure definitions, update procedures, and current pricing information.
+- **`src/tokenEstimators.json`**: Character-to-token ratio estimators for different AI models. See `src/README.md` for update instructions.
+- **`src/modelPricing.json`**: Model pricing data with input/output costs per million tokens. Includes metadata about pricing sources and last update date. See `src/README.md` for detailed update instructions and current pricing sources.
 - **`package.json`**: Defines activation events, commands, and build scripts.
 - **`esbuild.js`**: The build script that bundles the TypeScript source and JSON data files.