chore(typescript): introduce sdk design docs

Author: dsinghvi

fern/products/sdks/overview/typescript/design.mdx

@@ -3,4 +3,24 @@ title: Typescript SDK Design
 description: "Key design decisions behind our TypeScript SDK generator"
 ---
 
-Learn about the design principles and philosophy behind the Fern Typescript SDK. 
+<CardGroup cols={3}>
+  <Card title="Dependency Free" icon="regular box">
+    Zero external dependencies.
+  </Card>
+
+  <Card title="Isomorphic" icon="regular globe">
+    Works seamlessly in both Node.js and browser environments.
+  </Card>
+
+  <Card title="Strongly Typed" icon="regular code">
+    Full TypeScript support.
+  </Card>
+
+  <Card title="Auto-pagination" icon="regular arrows-alt-h">
+    Handle paginated responses with built-in iterators.
+  </Card>
+
+  <Card title="Forwards Compatibility" icon="regular sync">
+    Designed to fail gracefully as your API evolves.
+  </Card>
+</CardGroup>