docs: add section explaining Types global namespace usage (#97)

docs/types-global-namespace.md

@@ -0,0 +1,40 @@
+## Using the `Types` Global Namespace
+
+In a large-scale React + Redux + TypeScript project, it's often helpful to use the `Types` global namespace to share type definitions across your application.
+
+### ✅ Why Use a Global Namespace?
+
+- Central place to store common types like `User`, `Product`, etc.
+- No need to import types in every file.
+- Improves consistency and scalability.
+
+### 🔧 Example Setup
+
+1. Create a global declaration file:
+
+```ts
+// src/types/global.d.ts
+export {};
+
+declare global {
+  namespace Types {
+    type User = {
+      id: string;
+      name: string;
+      email: string;
+    };
+  }
+}
+### 💡 Usage Example
+
+Now you can use `Types` anywhere in your code **without importing**:
+
+```ts
+const greet = (user: Types.User) => {
+  console.log(`Hello, ${user.name}`);
+};
+
+const total = (product: Types.Product) => {
+  return product.price * 2;
+};
+