Update README.md

Author: unnamed-catalyst

README.md

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 # Coldstore App
+A store management app I made as a project for my university mobile application development course. The app uses Google's Firebase Cloud Firestore for its database.
+
+## Functions and Screenshots
+The app allows three types of users, each with varying levels of authority and functions:
+
+### Owners
+The store owner is allowed complete control over the data in the app, they can add and edit items, suppliers and staff members to the database. Schedules can be edited and created, and requests for changing trading schedules can also be responded to. Owners can also place new orders for inventory and respond to existing orders that were shipped by the suppliers, as well as viewing existing inventory and sales reports.
+
+- Owner Homepage
+
+![image](https://user-images.githubusercontent.com/59618797/215782339-7876ca76-4494-4f1a-b7af-3f51fe79b2ee.png)
+
+- View and Edit Staff Schedules
+
+![image](https://user-images.githubusercontent.com/59618797/215782372-1fd68ea4-70ee-4f99-ac24-5cff8091d502.png)
+
+- Create and Respond to Item Orders
+
+![image](https://user-images.githubusercontent.com/59618797/215782456-418952d0-32ef-4c25-9554-f7f1f8d3fa2d.png)
+
+
+### Staff
+The store's staff can view their schedules as well as request and respond to incoming shift trade requests. They can also report a new sale as well as view sales reports.
+
+- Staff Homepage
+
+![image](https://user-images.githubusercontent.com/59618797/215784821-972f2663-9f30-49c2-8e5c-b8882d9b8fe2.png)
+
+- Making a new Trade Shift Request
+
+![image](https://user-images.githubusercontent.com/59618797/215784870-8df78123-0edd-4885-86a0-dc231b632182.png)
+
+- Reporting a new sale
+
+![image](https://user-images.githubusercontent.com/59618797/215785082-65d82195-c398-4224-aa53-967e2b4da7d1.png)
+
+### Suppliers
+The store's suppliers are limited to viewing order history and responding to incoming order requests from the owners.
+
+- Supplier Homepage
+
+![image](https://user-images.githubusercontent.com/59618797/215785775-c67a3844-a696-4deb-93a5-524a16770462.png)
+
+- Order History
+
+![image](https://user-images.githubusercontent.com/59618797/215785836-2f204b94-5a35-4c64-bad3-024027cd7e69.png)
+