update readme with cover picture

Author: matas-bitbybit-dev

README.md

@@ -1,5 +1,7 @@
 # Bit By Bit Developers core library
 
+<img src="https://app.bitbybit.dev/assets/git-cover.png" alt="Picture showing bitbybit.dev platform">
+
 This project contains core 3D algorithms of Bit By Bit Developers platform which are open-sourced under MIT license. This library was previously UI dependant and is now separated to ensure protection of our corporate identity and cloud services.  
 
 Visit https://bitbybit.dev to use our full cloud platform.