[ADD] general: How to allow users to sign in with their Google account

general.rst

@@ -8,4 +8,5 @@ General
    :titlesonly:
 
    general/odoo_basics
-   general/base_import
+   general/base_import
+   general/auth

general/auth.rst

@@ -0,0 +1,8 @@
+================
+Authentification
+================
+
+.. toctree::
+   :titlesonly:
+
+   auth/google

general/auth/google.rst

@@ -0,0 +1,48 @@
+=======================================================
+How to allow users to sign in with their Google account
+=======================================================
+
+- Connect to your Google account and go to `https://console.developers.google.com/ <https://console.developers.google.com/>`_.
+
+- Click on **Create Project** and enter the project name and other details.
+
+.. image:: media/google01.png
+    :align: center
+
+.. image:: media/google02.png
+    :align: center
+
+- Click on **Use Google APIs**
+
+.. image:: media/google03.png
+    :align: center
+
+- On the left side menu, select the sub menu **Credentials** (from **API Manager**) then select **OAuth consent screen**.
+
+.. image:: media/google04.png
+    :align: center
+
+- Fill in your address, email and the product name (for example odoo) and then save.
+
+.. image:: media/google05.png
+    :align: center
+
+- Then click on **Add Credentials** and select the second option (OAuth 2.0 Client ID).
+
+.. image:: media/google06.png
+    :align: center
+
+.. image:: media/google07.png
+    :align: center
+
+- Check that the application type is set on **Web Application**. Now configure the allowed pages on which you will be redirected.
+
+- To achieve this, complete the field **Authorized redirect URIs**. Copy paste the following link in the box: http://mydomain.odoo.com/auth_oauth/signin. Then click on **Create**
+
+.. image:: media/google08.png
+    :align: center
+
+.. image:: media/google09.png
+    :align: center
+
+- Once done, you receive two information (your Client ID and Client Secret). You have to insert your Client ID in the **General Settings**.