feat(skills-next): add react-native SDK references (#249)

Author: evanpurkhiser

skills-next/references/sdks/react-native/error-monitoring.md

@@ -0,0 +1,43 @@
+# Expo Config Plugin Reference — Sentry React Native SDK
+
+Configure the plugin in `app.json` or `app.config.js`:
+
+```json
+{
+  "expo": {
+    "plugins": [
+      [
+        "@sentry/react-native/expo",
+        {
+          "url": "https://sentry.io/",
+          "project": "my-project",
+          "organization": "my-org",
+          "note": "Set SENTRY_AUTH_TOKEN env var for native builds"
+        }
+      ]
+    ]
+  }
+}
+```
+
+Or in `app.config.js` (allows env var interpolation):
+
+```javascript
+export default {
+  expo: {
+    plugins: [
+      [
+        "@sentry/react-native/expo",
+        {
+          url: "https://sentry.io/",
+          project: process.env.SENTRY_PROJECT,
+          organization: process.env.SENTRY_ORG,
+          disableAutoUpload: process.env.NODE_ENV === "development",
+        },
+      ],
+    ],
+  },
+};
+```
+
+> **Tip:** Set `disableAutoUpload: true` during local development to speed up builds by skipping source map and dSYM uploads. The option is available in SDK ≥8.13.0.