Add integrations anchor and preliminary framework integrations to docs

docs/integrations/frameworks/react.mdx

@@ -0,0 +1,34 @@
+---
+title: "React"
+---
+
+Prerequisite: [Install the CLI](/cli/overview)
+
+## Initialize Infisical for your [Create React App](https://create-react-app.dev)
+
+```bash
+# move to your React app
+cd /path/to/project
+
+# initialize infisical
+infisical init
+```
+
+## Modify the start script in your `package.json`
+
+```json
+...
+"scripts": {
+    "start": "infisical run -- react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
+    "eject": "react-scripts eject"
+}
+...
+```
+
+## Start your server with environment variables injected
+
+```bash
+yarn start
+```