feat: insert works

__database/diesel/src/models.rs

@@ -1,7 +1,16 @@
+use crate::schema::posts;
+
 #[derive(Queryable)]
 pub struct Post {
     pub id: i32,
     pub title: String,
     pub body: String,
     pub published: bool,
-}
+}
+
+#[derive(Insertable)]
+#[table_name = "posts"]
+pub struct NewPost<'a> {
+    pub title: &'a str,
+    pub body: &'a str,
+}