docs: add table tutorial

docs/pages/tutorials.mdx

@@ -7,6 +7,8 @@ These tutorials teach you how to do various things with MUD.
 [These tutorials](tutorials/minimal) teach you how to make various changes to [the getting started example](https://github.com/latticexyz/mud/tree/main/examples/minimal).
 This is an easy way to learn how to modify MUD functionality in various ways.
 
+- [Extend the schame](tutorials/minimal/extend_schema): 
+  In this tutorial you extend the schema and learn how to lookup information using a key.
 - [Add a system](tutorials/minimal/add_system):
   In this tutorial you add a system to decrement the counter and update the application to use it.
 

docs/pages/tutorials/minimal.mdx

@@ -28,4 +28,5 @@ To create the basic version to modify, follow these steps:
 
 ## The tutorials
 
+- [Extend the schema](minimal/extend_schema)
 - [Add a system](minimal/add_system)

docs/pages/tutorials/minimal/_meta.js

@@ -1,3 +1,4 @@
 export default {
-  add_system: "Add a system",
+  "extend_schema": "Extend the schema",
+  "add_system": "Add a system",
 };