Prepare Interfaces lesson

Author: mstephen19

content/academy/switching_to_typescript/interfaces.md

@@ -0,0 +1,23 @@
+---
+title: Interfaces (+ mini project)
+description: description
+menuWeight: 7.8
+paths:
+    - switching-to-typescript/interfaces
+---
+
+# [](#interfaces) Interfaces
+
+Interfaces just object types
+
+can extend each other
+
+classes can extend them to add class constraints
+
+## [](#mini-project) Mini-project
+
+1. Make custom interface for API response
+2. Case interface type to API response
+3. Make custom interface for modified API response (with omitted key with `Omit` + extra custom key using `extends`)
+4. Filter the data/modify it somehow
+5. Return the data having the new modified response type array

content/academy/switching_to_typescript/watch_mode_and_tsconfig.md

@@ -291,4 +291,4 @@ And our files in **src** will automatically compile into a folder named **dist**
 
 ## [](#next) Next up
 
-something
+[something]({{@link switching_to_typescript/interfaces.md}})