chore: add hire us section to readme (software-mansion#2181)

This PR adds a "Hire us" section to the README with a link to the
contact form.

Author: kacperkapusciak

README.md

@@ -233,3 +233,7 @@ This project has been build and is maintained thanks to the support from [Shopif
 [![shopify](https://avatars1.githubusercontent.com/u/8085?v=3&s=100 'Shopify.com')](https://shopify.com)
 [![expo](https://avatars2.githubusercontent.com/u/12504344?v=3&s=100 'Expo.io')](https://expo.io)
 [![swm](https://logo.swmansion.com/logo?color=white&variant=desktop&width=150&tag=react-native-reanimated-github 'Software Mansion')](https://swmansion.com)
+
+## React Native Screens is created by Software Mansion
+
+Since 2012 [Software Mansion](https://swmansion.com) is a software agency with experience in building web and mobile apps. We are Core React Native Contributors and experts in dealing with all kinds of React Native issues. We can help you build your next dream product – [Hire us](https://swmansion.com/contact/projects?utm_source=screens&utm_medium=readme).