added rust file

app/src-tauri/src/network.rs

+use reqwest;
+
+use serde::{Serialize, Deserialize};
+use serde_json;
+
+const APIURL: &str = "https://librehomework-api.herokuapp.com/";
+
+#[derive(Deserialize, Serialize)]
+pub struct ApiResponse {
+    error: Option<String>,
+    data: Option<String>,
+}
+
+impl std::convert::From<reqwest::Error> for ApiResponse {
+    fn from(e: reqwest::Error) -> Self {
+        ApiResponse {
+            error: Some(e.to_string()),
+            data: None,
+        }
+    }
+}
+
+
+#[tauri::command]
+pub async fn request(url: &str, method: Option<&str>, body: Option<String>) -> Result<(ApiResponse, u16), String> {
+    let mut _url = url.to_string();
+    let client = reqwest::Client::new();
+    if &url.len() > &8 && &url[0..8] != "https://" {
+        _url = APIURL.to_owned() + &_url;
+    }
+    println!("{}", &_url);
+    let res = match method {
+        Some(m) => if m == "POST" {
+                            client.post(_url).json(&body).send().await
+                        } else {
+                            client.get(_url).send().await
+                        },
+        None => client.get(_url).send().await
+
+    }.map_err(|e| e.to_string())?;
+
+    let status = res.status().as_u16();
+
+    let apires: ApiResponse = res.json().await.map_err(|e| e.to_string())?;
+    Ok( (apires, status) )
+}
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