Function login

login(login, password): Promise<JSessionData>
JMap.User.login

The login function, returns a promise. Make a call to the server and if login is successful resolve the promise providing the user session data.

If an error occurs, 3 differents string message can be returned :
- "user.login.error.credential" => Bad username or password
- "user.login.error.server" => Unexpected error while requesting the server
- "user.login.error.unexpected" => Unexpected error client side
Parameters
- login: string
  The user's username
- password: string
  The user's password
Returns Promise<JSessionData>
Throws
Error if bad credentials or server error.

Example
```
const userLogin = "jdo@mycompany.com"
const userPassword = "xxx"

// Open a new user session, and get back user data from server
JMap.User
   .login(userLogin, userPassword)
   .then(sessionData => {
     console.log(`User ${userLogin} has been authenticated, his session token is "${sessionData.accessToken}"`)
   })
   .catch(errorKey => {
     console.error(`Cannot loggin ${userLogin}, errorKey="${errorKey}"`, error)
   })
```