Merge branch 'feat/README.md' into 'master'

Added README

See merge request !1

README.md

+#Warehouse Management (WM)
+
+---
+## What To Expect
+#### API Contracts
+- **No APIs made for public consumption.**
+
+#### Inventory, Pricing, & Promotions
+- Warehouse Management (WM) to provide Kafka message upon order fulfillment or cancellation.
+
+#### E-Commerce
+- None
+
+#### Order Management
+- Warehouse Management (WM) to expect Kafka message upon order creation.
+- WM to provide Kafka message upon order fulfillment or cancellation.
+
+---
+
+## Details
+#### Schema
+```
+{
+    _id: String
+    orderId: String
+    status: String "unfulfilled" (default) > "fulfilled"/"cancelled"
+    orderObject?: (will have it on initial Kafka message, not sure if we need to store this)
+}
+```
+
+#### Workflow
+- Warehouse Management (WM) expects an Order object (?) from Order Management (OM) on order placement in Kafka.
+- On receipt of an Order object, WM will create a warehouse order entry in database with a status of "unfulfilled."
+- In the WM UI, a warehouse manager will have the ability to fulfill or cancel unfulfilled orders.
+- When an order is marked **"fulfilled"** or **"cancelled"**, a Kafka message will be sent to be consumed.
+
+#### UI
+- Login
+- Order status update screen mark orders as fulfilled or cancelled
+- Order search
+- Order information page
+
+
+~~Warehouse UI - ReactJS UI to mark orders as fulfilled or cancelled.
+Spring boot backend, CRU endpoints for orders
+ReactJS front end, search orders, view order status in table, update status
+Update the status order management system via Kafka.
+Java program that subscribes to “order topic” and pushes status updates
+Database: Mongo
+Kafka message going to be sent to Inventory, Pricing, and Promotions (IPP) to update the Inventory, pricing, and promotion about the items for which order is fulfilled.
+Java program that subscribes to “order topic” and pushes status updates~~
+
+~~Warehouse Database: (sample order (?): { item1: 2qty, item2: 1qty, item3: 5qty })~~
+
+~~Need to check inventory to see if there is adequate inventory for each item in the Order
+If there is adequate inventory for every item:
+WM will send back a “fulfilled” status to OM (Kafka)
+WM will update the Warehouse Database with status to “fulfilled”.
+Else:
+WM will send back a “cancelled” status to OM (Kafka),
+? - along with the inventory error message (includes qty)
+WM will update the Warehouse Database with status to “cancelled”.~~
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