feat: design applications and first api calls

Co-authored-by: Walid <87608619+WalidKorchi@users.noreply.github.com>

cypress/fixtures/users/signin/post.ts

@@ -0,0 +1,28 @@
+import { Handler } from '../../handler'
+
+export const postUsersSigninHandler: Handler = {
+  method: 'POST',
+  url: '/users/signin',
+  response: {
+    statusCode: 200,
+    body: {
+      accessToken: 'access-token',
+      refreshToken: 'refresh-token',
+      expiresIn: 3600000,
+      type: 'Bearer'
+    }
+  }
+}
+
+export const postUsersSigninInvalidCredentialsHandler: Handler = {
+  method: 'POST',
+  url: '/users/signin',
+  response: {
+    statusCode: 400,
+    body: {
+      statusCode: 400,
+      error: 'Bad Request',
+      message: 'Invalid credentials.'
+    }
+  }
+}