Added readme

src/api/order_controller.rs

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+use actix_web::{get, HttpResponse, post, web};
+
+use crate::models::order::*;
+use crate::utils::api_error::ApiError;
+use serde::{Deserialize, Serialize};
+
+/// Model for user input for an __Order__ item
+#[derive(Serialize, Deserialize, Debug)]
+pub struct InputOrderDetail {
+    pub productid: i32,
+    pub quantity: i32,
+}
+
+/// Model for user input for an __Order__
+#[derive(Serialize, Deserialize, Debug)]
+pub struct InputOrder {
+    pub email: String,
+    pub line_items: Vec<InputOrderDetail>
+}
+
+#[get("/orders")]
+async fn find_all() -> core::result::Result<HttpResponse, ApiError> {
+    Ok(HttpResponse::Ok().json(Order::find_all()))
+}
+
+/// Accepts JSON input in the following format:-
+/// ```json
+/// {
+///  "email": "mail@id.com",
+///  "line_items": [
+///     {
+///         "productid": 1,
+///         "quantity": 10
+///     },
+///     {
+///         "productid": 2,
+///         "quantity": 30
+///     }
+///  ]
+///}
+/// ```
+#[post("/orders")]
+async fn insert_order(order: web::Json<InputOrder>) -> core::result::Result<HttpResponse, ApiError> {
+    Ok(HttpResponse::Ok().json(Order::insert(order.into_inner())))
+}
+
+pub fn routes(cfg: &mut web::ServiceConfig) {
+    cfg.service(find_all);
+    cfg.service(insert_order);
+}