Update README.md

Updated image sizes / fixed IzzyDroid Badge

README.md

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 ![GitHub](https://img.shields.io/github/license/Teifun2/nextcloud-cookbook-flutter) ![GitHub release (latest by date)](https://img.shields.io/github/v/release/Teifun2/nextcloud-cookbook-flutter) ![GitHub Workflow Status (branch)](https://img.shields.io/github/workflow/status/Teifun2/nextcloud-cookbook-flutter/Build/master)
 
-[![IzzyDorid](assets/IzzyOnDroid.png)(https://apt.izzysoft.de/fdroid/index/apk/com.nextcloud_cookbook_flutter)]
+[<img src="assets/IzzyOnDroid.png" alt="IzyyDroid" height="80px" />](https://apt.izzysoft.de/fdroid/index/apk/com.nextcloud_cookbook_flutter)
 # Nextcloud Cookbook Mobile Client written in Flutter
 
 This project aims to provide a mobile client for both Android and IOs for the nextcloud app cookbook (https://github.com/nextcloud/cookbook)
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 ## Screenshots
 
-![Screenshot_categories](https://user-images.githubusercontent.com/7461832/91664922-899d6400-eaf2-11ea-8120-3222bd5b5363.png)
-![Screenshot_category_list](https://user-images.githubusercontent.com/7461832/91664920-8904cd80-eaf2-11ea-9bb3-62e0b41f85c0.png)
-![Screenshot_recipe_1](https://user-images.githubusercontent.com/7461832/91664918-873b0a00-eaf2-11ea-86a6-e30fde4c98a9.png)
-![Screenshot_recipe_2](https://user-images.githubusercontent.com/7461832/91664923-8a35fa80-eaf2-11ea-9bfe-6ed8edc41b49.png)
+<img src="https://user-images.githubusercontent.com/7461832/91664922-899d6400-eaf2-11ea-8120-3222bd5b5363.png" alt="Screenshot_categories" width="300px" />    <img src="https://user-images.githubusercontent.com/7461832/91664920-8904cd80-eaf2-11ea-9bb3-62e0b41f85c0.png" alt="Screenshot_category_list" width="300px" />
+
+<img src="https://user-images.githubusercontent.com/7461832/91664923-8a35fa80-eaf2-11ea-9bfe-6ed8edc41b49.png" alt="Screenshot_recipe_2" width="300px" />    <img src="https://user-images.githubusercontent.com/7461832/91664918-873b0a00-eaf2-11ea-86a6-e30fde4c98a9.png" alt="Screenshot_recipe_1" width="300px" />