Add README

Author: tinvaan

provider/techstack/README.md

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+# Tech Stack File context provider for OpenCodeGraph
+
+This is a context provider for [OpenCodeGraph](https://opencodegraph.org) that annotates your code with metadata such as package category and package homepage urls provided by a corresponding `techstack.yml` file.
+
+## Example
+![OpenCodeGraph Techstack provider in action](./examples/demo.gif)
+
+## Usage
+
+Provide the absolute file path of the techstack yml file in the settings.
+```json
+"opencodegraph.providers": {
+    // ... other providers ...
+    "https://opencodegraph.org/npm/@opencodegraph/provider-techstack": {
+        "yaml": "</full/path/to/techstack.yml>"
+    }
+}
+```
+
+## Notes
+
+- The Tech Stack File provider for [OpenCodeGraph](https://opencodegraph.org) currently provides annotations for `.js(x)` and `.ts(x)` files.
+
+    ```typescript
+    capabilities(params: CapabilitiesParams, settings: Settings): CapabilitiesResult {
+        // TODO: support more languages
+        return { selector: [{ path: '**/*.js?(x)' }, { path: '**/*.ts?(x)' }] }
+    },
+    ```
+
+- Tech Stack File provider annotates packages detected in your project's `package.json` against CommonJS and ES Module import statements in your code.