docs: Add documentation supporting native, asynchronous database operations (#580)

* feat: add sea orm documents

* feat: add description for sea orm cli

examples/sea-orm-databases/src/main.rs

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+use std::io;
+
+use actix_web::{error, web, App, HttpResponse, HttpServer, Responder};
+use sea_orm::{ActiveModelTrait, Database, DatabaseConnection, Set};
+use serde::Serialize;
+use uuid::Uuid;
+
+// <handler>
+// Importing the existing entity modules
+pub mod prelude;
+pub mod users;
+use crate::users::ActiveModel as UserActiveModel;
+
+#[derive(Debug, Serialize)]
+struct User {
+    id: String,
+    name: String,
+}
+
+async fn insert_new_user(
+    conn: &DatabaseConnection,
+    user_name: String,
+) -> Result<User, sea_orm::DbErr> {
+    // Create insertion model
+    let uid = Uuid::new_v4().to_string();
+    let new_user = UserActiveModel {
+        id: Set(uid.clone()),
+        name: Set(user_name),
+        ..Default::default()
+    };
+
+    // Insert the user
+    let user = new_user.insert(conn).await?;
+
+    Ok(User {
+        id: user.id,
+        name: user.name,
+    })
+}
+// </handler>
+
+// <main>
+#[actix_web::main]
+async fn main() -> io::Result<()> {
+    let database_url = "sqlite:app.db";
+    let conn = Database::connect(database_url)
+        .await
+        .expect("Failed to connect to database");
+
+    HttpServer::new(move || {
+        App::new()
+            .app_data(web::Data::new(conn.clone()))
+            .route("/{name}", web::get().to(index))
+    })
+    .bind(("127.0.0.1", 8080))?
+    .run()
+    .await
+}
+// </main>
+
+// <index>
+async fn index(
+    conn: web::Data<DatabaseConnection>,
+    name: web::Path<(String,)>,
+) -> actix_web::Result<impl Responder> {
+    let (name,) = name.into_inner();
+
+    let user = insert_new_user(&conn, name)
+        .await
+        .map_err(error::ErrorInternalServerError)?;
+
+    Ok(HttpResponse::Ok().json(user))
+}
+// </index>

examples/sea-orm-databases/src/mod.rs

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+//! `SeaORM` Entity, @generated by sea-orm-codegen 1.1.4
+
+pub mod prelude;
+
+pub mod users;

examples/sea-orm-databases/src/prelude.rs

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+//! `SeaORM` Entity, @generated by sea-orm-codegen 1.1.4
+
+pub use super::users::Entity as Users;

examples/sea-orm-databases/src/users.rs

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+//! `SeaORM` Entity, @generated by sea-orm-codegen 1.1.4
+
+use sea_orm::entity::prelude::*;
+
+#[derive(Clone, Debug, PartialEq, DeriveEntityModel, Eq)]
+#[sea_orm(table_name = "users")]
+pub struct Model {
+    #[sea_orm(primary_key, auto_increment = false)]
+    pub id: String,
+    pub name: String,
+}
+
+#[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
+pub enum Relation {}
+
+impl ActiveModelBehavior for ActiveModel {}