docs(readme): add Kickstarter notice to README.md. (fishfolk#781)

README.md

@@ -4,6 +4,8 @@
 
 ![Fish Folk: Jumpy Preview](https://user-images.githubusercontent.com/24392180/151969075-399e9fea-e2de-4340-96a4-0a0e5b79c281.gif)
 
+👉 **[Live on Kickstarter!](https://www.kickstarter.com/projects/erlendsh/fish-folk)** 👈
+
 ## Introduction
 
 Fish Folk: Jumpy is a tactical 2D shooter, played by up to 4 players online or on a shared screen. Aim either left or right; the rest is up to clever movement and positioning in this fish-on-fish brawler! For more information about our origin story (Duck Game et.al.) and big-picture plans, see our [design document](https://www.notion.so/erlendsh/Fish-Fight-1647ed74217e4e38a59bd28f4f5bc81a).