Implement sso announcment

package it.niedermann.owncloud.notes.android.activity;

import android.app.AlertDialog;

import android.app.SearchManager;

import android.content.DialogInterface;

import android.content.Intent;

import android.content.SharedPreferences;

import android.content.pm.ShortcutInfo;

        setupNotesList();

        setupNavigationList(categoryAdapterSelectedItem);

        setupNavigationMenu();

        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);

        boolean ssoAnnouncmentShown = prefs.getBoolean("sp_sso_announchment_shown", false);

        if(!ssoAnnouncmentShown) {

            AlertDialog dialog = new AlertDialog.Builder(this)

                    .setTitle("Announcment")

                    .setCancelable(false)

                    .setMessage("The android app will beginning with the next major version depend on the great Single-Sign-On-Feature of Nextcloud.\n\nPlease make sure, you have installed at least version 3.8.0 of the files app and select at the first run the same account which you are already using.")

                    .setNegativeButton("More information", (a, b) -> {

                        startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("https://github.com/stefan-niedermann/nextcloud-notes/blob/master/SSO%20Announcment.md")));

                    })

                    .setPositiveButton("Understood" , (a, b) -> {

                        SharedPreferences.Editor editor = prefs.edit();

                        editor.putBoolean("sp_sso_announchment_shown", true);

                        editor.apply();

                    })

                    .show();

            dialog.getButton(DialogInterface.BUTTON_POSITIVE).setTextColor(getResources().getColor(R.color.fg_default));

            dialog.getButton(DialogInterface.BUTTON_NEGATIVE).setTextColor(getResources().getColor(R.color.fg_default));

        }

    }

    @Override

- Announcment for Nextcloud Single-Sign-On

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