Android refresh method

[CaolanCode]

Hi,

Thanks for you work on the plugin. It's awesome.

I've created a refresh function to return the accessToken and idToken for Android users.
Both IOS and Web have working refresh methods.
Can you guide me to what documentation you like me to contribute for this commit?

[reslear]

write about refresh method, and how to use

[CaolanCode]

Android Refresh Method

This method should be called when the app is initialized to establish if the user is currently logged in. If true, the method will return an accessToken, idToken and an empty refreshToken. It has the same functionality as the web refresh method.

Example

  initializeApp() {
    this.platform.ready().then(() => {
      this.checkLoggedIn();
    });
  }

  checkLoggedIn() {
    GoogleAuth.refresh()
      .then((data) => {
        if (data.accessToken) {
          this.currentToken = data;
          const storedUser = localStorage.getItem('user');
          if (storedUser) {
            this.user = JSON.parse(storedUser);
          }
        }
      })
      .catch((error) => {
        if (error.type === 'userLoggedOut') {
          this.signin();
        }
      });
  }

[reslear]

yes, but add to https://github.com/CodetrixStudio/CapacitorGoogleAuth/blob/master/README.md

[CaolanCode]

Will do.

[CaolanCode]

I've submitted the documentation to the README.md