update readme

README.md

@@ -1,9 +1,29 @@
-# Fabric Example Mod
+# Spring!
 
-## Setup
+Spring! adds trampoline blocks to the game.
 
-For setup instructions please see the [fabric wiki page](https://fabricmc.net/wiki/tutorial:setup) that relates to the IDE that you are using.
+Trampoline blocks propel the player (or any entity) higher when jumped on. Fun!
 
-## License
+Trampoline blocks can be powered by redstone to make the entity automatically jump.
 
-This template is available under the CC0 license. Feel free to learn from it and incorporate it in your own projects.
+Trampoline blocks are crafted as follows:
+
+```
+III
+MMM
+CCC
+```
+
+... where `I` is an iron bar, `M` is the material to make the spring block from, and `C` is cobblestone.
+
+The materials you can use (and their corresponding "forces") are:
+
+| Material        | Force  | Block height |
+| --------------- | ------ | ------------ |
+| Coal            | 1.975  | 4.2          |
+| Copper Ingot    | 2.222  | 5.2          |
+| Iron Ingot      | 2.451  | 6.2          |
+| Gold Ingot      | 2.8706 | 8.2          |
+| Emerald         | 3.2386 | 10.2         |
+| Diamond         | 3.9142 | 14.2         |
+| Netherite Ingot | 4.649  | 19.2         |