feat: update readme with examples

README.md

@@ -5,18 +5,52 @@ this package allows you to access wallpaper tools from native apis
 ## Installation
 
 ```sh
-npm install rn-manage-wallpaper
+yarn add rn-manage-wallpaper
+```
+
+## After install run this to link the packages.
+```sh
+yarn android
+```
+
+## permissions
+
+this package needs the following permissions:
+
+```xml
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 ```
 
 ## Usage
 
+WallpaperManager has one function called setWallpaper that receives 2 arguments, file uri and a flag that indicates whenever it will be set as lock screen or system screen, [FLAG_LOCK](https://developer.android.com/reference/android/app/WallpaperManager#FLAG_LOCK) and [FLAG_SYSTEM](https://developer.android.com/reference/android/app/WallpaperManager#FLAG_SYSTEM) for reference, you can get their values using the getConstants function.
+
+## Example
+
+in this example i use RNFetchBlob to donwload a web image and use the cache file path to define the wallpaper
+
 ```js
 import WallpaperManager from 'rn-manage-wallpaper';
 
 // ...
 
-const result = await WallpaperManager.multiply(3, 7);
-```
+const FLAG_CONSTANTS = WallpaperManager.getConstants();
+RNFetchBlob.config({
+      // add this option that makes response data to be stored as a file,
+      fileCache: true,
+    })
+      .fetch('GET', image.url, {
+        //some headers ..
+      })
+      .then(res => {
+        try {
+          WallpaperManager.setWallpaper(`${res.path()}`, FLAG_CONSTANTS.FLAG_SYSTEM);
+        } catch (error) {
+          console.log(error);
+        }
+      });
+  ```
 
 ## Contributing