Add signin page.

frontend/src/app/core/rest-services/user/model/signin.model.ts

@@ -0,0 +1,5 @@
+export interface SigninRequest {
+    pseudo?: string;
+    email?: string;
+    password?: string;
+}

frontend/src/app/core/rest-services/user/user.rest-service.ts

@@ -2,6 +2,7 @@ import { HttpClient } from "@angular/common/http";
 import { Injectable, inject } from "@angular/core";
 import { LoginRequest, LoginResponse } from "./model/login.model";
 import { lastValueFrom } from "rxjs";
+import { SigninRequest } from "./model/signin.model";
 
 @Injectable({
     providedIn: 'root'
@@ -12,4 +13,8 @@ export class UserRestService {
     login(request: LoginRequest): Promise<LoginResponse> {
         return lastValueFrom(this.httpClient.post<LoginResponse>('/api/users/login', request));
     }
+
+    signin(request: SigninRequest): Promise<void> {
+        return lastValueFrom(this.httpClient.post<void>('/api/users', request));
+    }
 }