ionic-cli: [CLI 3] Error trying to add android platform

Short description of the problem:

I’m trying to add the android platform to my project using ionic cordova platform add android and I get the following error:

c:\xampp\htdocs\myproj>ionic cordova platform add android
> cordova platform add android --save
✖ Running command - failed!

[ERROR] Cordova encountered an error.
        You may get more insight by running the Cordova command above directly.

[ERROR] An error occurred while running cordova platform add android --save (exit code 1):

        Error: Current working directory is not a Cordova-based project.

I tried to run cordova platform add android --save as the error refers, and I get the following error:

c:\xampp\htdocs\myproj>cordova platform add android --save
Using cordova-fetch for cordova-android@~6.2.2
Error: Failed to fetch platform cordova-android@~6.2.2
Probably this is either a connection problem, or platform spec is incorrect.
Check your connection and platform name/version/URL.
Failed to get absolute path to installed module

What behavior are you expecting?

adding android platform in the CLI 3

Steps to reproduce:

1. run ionic cordova platform add android

Post the output of ionic info below please

global packages:

    @ionic/cli-utils : 1.2.0
    Cordova CLI      : 7.0.1
    Ionic CLI        : 3.2.0

local packages:

    @ionic/app-scripts              : 1.3.7
    @ionic/cli-plugin-cordova       : 1.2.1
    @ionic/cli-plugin-ionic-angular : 1.2.0
    Cordova Platforms               : none
    Ionic Framework                 : ionic-angular 3.3.0

System:

    Node       : v6.10.3
    OS         : Windows 10
    Xcode      : not installed
    ios-deploy : not installed
    ios-sim    : not installed