*** All the requirements below relate both ios and android os. ***
1. application should have an AccountId setting that can be change before any build
2. Implement push notification (on google Firebase Cloud Messaging).
a. Enable global and specific push messages.
must have the ability to send push to specific group of users or to all users.
b. Should be done on both ios and android versions.
c. I will provide the backend web services for register a client. web serivce
parameters must includes AccountId.
3. provide working asp.net (win form or web site) for sending push message to
specific device and to all devices
4. teach me how to build sign apk
5. project is completed when both ios and android getting published.