docs(): add initial documentation

Author: wbhob

README.md

@@ -1,7 +1,29 @@
 # Nest Middlewares
 Add the most common Express middlewares to your Nest app with one line.
 
-Currently supports:
+### Usage
+Take the name of your favorite Express middleware and prefix it with `@nest-middlewares/`.
+```
+$ npm install --save @nest-middlewares/helmet
+```
+In your module:
+```ts
+import { HelmetMiddleware } from '@nest-middlewares/helmet'; // (look around in the source code for the exact class name)
+
+@Module(...)
+export class MyModule {
+    configure(consumer: MiddlewaresConsumer) {
+        // IMPORTANT! Call Middleware.configure BEFORE using it for routes
+        HelmetMiddleware.configure( /* options as per helmet docs */ )
+        consumer.apply(HelmetMiddleware).forRoutes(
+            /* your routes */
+        );
+    }
+}
+```
+
+
+### Currently supports:
 - **Compression**
 - Connect RID
 - Connect Timeout