Added Android setup steps (#383)

Author: vicajilau

packages/pasteboard/README.md

@@ -2,19 +2,20 @@
 
 [![Pub](https://img.shields.io/pub/v/pasteboard.svg)](https://pub.dev/packages/pasteboard)
 
-A flutter plugin which could read image,files from clipboard and write files to clipboard.
+A Flutter plugin that allows reading images and files from the clipboard and writing files to the clipboard.
 
-|         |     |
-|---------|-----|
-| Windows | ✅   |
-| Linux   | ✅   |
-| macOS   | ✅   |
-| iOS     | ✅   |
-| Web     | ✅   |
+| Platform | Supported | Requires Setup |
+|----------|---------- |--------------- |
+| Windows  | ✅        | No             |
+| Linux    | ✅        | No             |
+| macOS    | ✅        | No             |
+| iOS      | ✅        | No             |
+| Web      | ✅        | No             |
+| Android  | ✅        | Yes            |
 
 ## Getting Started
 
-1. add `package:pasteboard` to `pubspec.yaml`
+1. Add `package:pasteboard` to `pubspec.yaml`:
 
    ```yaml
    dependencies:
@@ -40,6 +41,42 @@ A flutter plugin which could read image,files from clipboard and write files to
    }
    ```
 
+## Android Setup
+To use this package on Android without errors, follow these steps:
+
+1. Add the following `<provider>` entry inside the `<application>` tag in your AndroidManifest.xml (`android/app/src/main/AndroidManifest.xml`):
+
+```xml
+<provider
+    android:name="androidx.core.content.FileProvider"
+    android:authorities="${applicationId}.provider"
+    android:exported="false"
+    android:grantUriPermissions="true">
+    <meta-data
+        android:name="android.support.FILE_PROVIDER_PATHS"
+        android:resource="@xml/provider_paths" />
+</provider>
+```
+2. Create the file `provider_paths.xml` at `android/app/src/main/res/xml/provider_paths.xml` with the following content:
+
+```xml
+<?xml version="1.0" encoding="utf-8"?>
+<paths xmlns:android="http://schemas.android.com/apk/res/android">
+    <external-path
+        name="external_files"
+        path="." />
+</paths>
+```
+
+### Common Issues
+If these steps are not followed, you may encounter the following runtime error:
+
+```
+Couldn't find meta-data for provider with authority
+```
+
+Make sure the `<provider>` entry is correctly added to the `AndroidManifest.xml` and that the `provider_paths.xml` file exists in the correct location.
+
 ## License
 
 See the [LICENSE](LICENSE) file for the full license.