docs(examples): add form_choices usage to peewee_simple example

Author: hasansezertasan

examples/peewee_simple/main.py

@@ -42,6 +42,7 @@ class Post(BaseModel):
     title = CharField(max_length=120)
     text = peewee.TextField(null=False)
     date = peewee.DateTimeField()
+    status = CharField(max_length=20, default="draft")
 
     user = peewee.ForeignKeyField(User)
 
@@ -70,6 +71,15 @@ class PostAdmin(ModelView):
 
     form_ajax_refs = {"user": {"fields": (User.username, "email")}}
 
+    form_choices = {
+        "status": [
+            ("draft", "Draft"),
+            ("review", "In Review"),
+            ("published", "Published"),
+            ("archived", "Archived"),
+        ]
+    }
+
 
 class Book(BaseModel):
     isbn = CharField(max_length=13, primary_key=True)