Add a blog crate for demonstrating states

blog/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "blog"
+version = "0.1.0"

blog/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "blog"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

blog/src/lib.rs

@@ -0,0 +1,19 @@
+pub struct Post {
+    state: Option<Box<dyn State>>,
+    content: String,
+}
+
+impl Post {
+    pub fn new() -> Post {
+        Post {
+            state: Some(Box::new(Draft {})),
+            content: String::new(),
+        }
+    }
+}
+
+trait State {}
+
+struct Draft {}
+
+impl State for Draft {}

rust-exercises.code-workspace

@@ -1,5 +1,8 @@
 {
     "folders": [
+        {
+            "path": "./blog"
+        },
         {
             "path": "./gui"
         },