preparing svelte login, mastered translations

frontend/src/user.svelte.js

@@ -0,0 +1,20 @@
+export const user = $state({
+    name : null
+})
+
+export async function tryLogin(credentials){
+    var url = `${location.protocol}//${location.host.replace('5173','8080')}/api/user/login`;
+    let response = await fetch(url,{
+        headers: {
+            'Content-Type':'application/json'
+        },
+        method: 'POST',
+        body: JSON.stringify(credentials)
+    });
+    if (response.ok){
+        const json = await response.json();
+        for (var key of Object.keys(json)) user[key] = json[key];
+    } else {
+        alert("Login failed!");
+    }
+}