chore: add demo gifs to README

README.md

@@ -4,11 +4,25 @@
 
 Implementation of [NEAT(NeuroEvolution of Augmenting Topologies)](http://nn.cs.utexas.edu/downloads/papers/stanley.ec02.pdf) algorithm in Rust.
 
+## Demo
+
+### XOR gate
+
+![ezgif com-video-to-gif-2](https://user-images.githubusercontent.com/8275026/120089350-4715c000-c134-11eb-9f57-a0997b6f6600.gif)
+
+### Function approximation (sine function)
+
+![ezgif com-video-to-gif-3](https://user-images.githubusercontent.com/8275026/120089355-50069180-c134-11eb-84d4-658c89a3e181.gif)
+
+### Flappy bird
+
+![ezgif com-video-to-gif](https://user-images.githubusercontent.com/8275026/120089358-56950900-c134-11eb-9c0a-bbf4d09347bb.gif)
+
 ## Roadmap
 
 - [x] Basic NEAT algorithm implementation
 - [x] XOR example
 - [x] Function approximation example (sine function)
 - [ ] [Open AI gym](https://gym.openai.com) environment examples
-- [ ] Real world game examples (Flappy Bird, Snake, etc.)
+- [x] Real world game examples (Flappy Bird, Snake, etc.)
 - [ ] Complexity-based speciation