Convert to simple apps with package.json and run callout

- Add package.json to each exercise step (problem and solution)
- Add run callout to problem README.mdx files

Author: kentcdodds

exercises/01.classes/01.problem.class-basics/README.mdx

@@ -26,3 +26,5 @@ class ClassName {
 ```
 
 📜 [TypeScript Handbook - Classes](https://www.typescriptlang.org/docs/handbook/2/classes.html)
+
+🐨 Once you've completed the exercise, run `node index.ts` in the playground to test your work!

exercises/01.classes/01.problem.class-basics/package.json

@@ -0,0 +1,7 @@
+{
+  "name": "exercises_01.classes_01.problem.class-basics",
+  "type": "module",
+  "scripts": {
+    "start": "node index.ts"
+  }
+}

exercises/01.classes/01.solution.class-basics/package.json

@@ -0,0 +1,7 @@
+{
+  "name": "exercises_01.classes_01.solution.class-basics",
+  "type": "module",
+  "scripts": {
+    "start": "node index.ts"
+  }
+}

exercises/01.classes/02.problem.constructors/README.mdx

@@ -31,3 +31,5 @@ constructor(public name: string, private age: number = 0) {}
 ```
 
 📜 [TypeScript Handbook - Parameter Properties](https://www.typescriptlang.org/docs/handbook/2/classes.html#parameter-properties)
+
+🐨 Once you've completed the exercise, run `node index.ts` in the playground to test your work!

exercises/01.classes/02.problem.constructors/package.json

@@ -0,0 +1,7 @@
+{
+  "name": "exercises_01.classes_02.problem.constructors",
+  "type": "module",
+  "scripts": {
+    "start": "node index.ts"
+  }
+}

exercises/01.classes/02.solution.constructors/package.json

@@ -0,0 +1,7 @@
+{
+  "name": "exercises_01.classes_02.solution.constructors",
+  "type": "module",
+  "scripts": {
+    "start": "node index.ts"
+  }
+}

exercises/02.access-modifiers/01.problem.public-private/README.mdx

@@ -21,3 +21,5 @@ class User {
 💰 Remember: Private members can only be accessed within the class methods.
 
 📜 [TypeScript Handbook - Access Modifiers](https://www.typescriptlang.org/docs/handbook/2/classes.html#member-visibility)
+
+🐨 Once you've completed the exercise, run `node index.ts` in the playground to test your work!

exercises/02.access-modifiers/01.problem.public-private/package.json

@@ -0,0 +1,7 @@
+{
+  "name": "exercises_02.access-modifiers_01.problem.public-private",
+  "type": "module",
+  "scripts": {
+    "start": "node index.ts"
+  }
+}

exercises/02.access-modifiers/01.solution.public-private/package.json

@@ -0,0 +1,7 @@
+{
+  "name": "exercises_02.access-modifiers_01.solution.public-private",
+  "type": "module",
+  "scripts": {
+    "start": "node index.ts"
+  }
+}

exercises/02.access-modifiers/02.problem.protected/README.mdx

@@ -30,3 +30,5 @@ class Derived extends Base {
 ```
 
 📜 [TypeScript Handbook - Protected](https://www.typescriptlang.org/docs/handbook/2/classes.html#protected)
+
+🐨 Once you've completed the exercise, run `node index.ts` in the playground to test your work!