doc: add small example to readme

doc: add save to deps flag

Closes #1

README.md

@@ -6,5 +6,58 @@ Minimalistic REST API client for React inspired by Apollo.
 # Installation
 
 ```bash
-npm install react-rest-request
+npm install react-rest-request --save
+```
+
+
+# Usage
+
+```typescript
+import React from 'react';
+import ReactDOM from 'react-dom';
+import { Endpoint, Method, useRequest, RequestProvider } from 'react-rest-request';
+
+const BASE_API_URL = 'https://sampleapis.com/movies/api';
+
+type Movie = Readonly<{
+    id: number;
+    title: string;
+    posterURL: string;
+    imdbId: string;
+}>
+
+const MoviesEndpoint: Endpoint = {
+    method: Method.GET,
+    url: '/action-adventure',
+};
+
+type MoviesResponse = Movie[];
+
+function App() {
+    const [movies, { data, loading }] = useRequest<MoviesResponse>(MoviesEndpoint);
+
+    React.useEffect(
+        () => {
+            movies();
+        },
+        [movies]
+    );
+
+    return !data ? (
+        <div>{ loading ? 'Loading...' : 'Something went wrong' }</div>
+    ) : (
+        <ul>
+            {data.map(movie => (
+                <li key={movie.id}>{movie.title}</li>
+            ))}
+        </ul>
+    );
+}
+
+ReactDOM.render(
+    <RequestProvider baseUrl={BASE_API_URL}>
+        <App />
+    </RequestProvider>,
+    document.getElementById('root'),
+);
 ```