Add OpenFeature integration docs

Author: cmanallen

docs/platforms/javascript/common/configuration/integrations/openfeature.mdx

@@ -0,0 +1,51 @@
+---
+title: OpenFeature
+description: "Attaches recent OpenFeature feature flag evaluations to error event context."
+notSupported:
+  - javascript.aws-lambda
+  - javascript.azure-functions
+  - javascript.bun
+  - javascript.capacitor
+  - javascript.cloudflare
+  - javascript.connect
+  - javascript.cordova
+  - javascript.deno
+  - javascript.electron
+  - javascript.express
+  - javascript.fastify
+  - javascript.gcp-functions
+  - javascript.hapi
+  - javascript.koa
+  - javascript.nestjs
+  - javascript.nodejs
+  - javascript.wasm
+---
+
+<Alert level="info">
+
+This integration only works inside a browser environment.
+
+</Alert>
+
+_Import name: `Sentry.openFeatureIntegration` and `Sentry.OpenFeatureIntegrationHook`_
+
+The [OpenFeature](https://https://openfeature.dev/) integration tracks feature flag evaluations produced by the OpenFeature SDK. These evaluations are held in memory and, in the event an error occurs, sent to Sentry for review and analysis. **At the moment, we only support boolean flag evaluations.**
+
+```JavaScript
+import * as Sentry from '@sentry/browser';
+import { OpenFeature } from '@openfeature/web-sdk';
+
+Sentry.init({integrations: [Sentry.openFeatureIntegration()]});
+
+const client = OpenFeature.getClient();
+client.addHooks(new OpenFeatureIntegrationHook());
+
+// Evaluating flags will record the result on the Sentry client.
+const result = client.getBooleanValue('my-flag', false);
+```
+
+Learn more about the OpenFeature SDK at https://github.com/open-feature/js-sdk/tree/main.
+
+## Options
+
+There are no setup options for this integration.