Added short README.md docs indicating necessary settings for API and frontend code bases

Humongous.Healthcare.Web/README.md

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+# Humongous.Healthcare.Web Web Application
+
+This codebase is a representative example of a web frontend that makes calls to the Health Check tracking API service for Humongous Healthcare.
+
+# Building the WebApp
+
+Before building the web application, it is necessary to define the following environment variables that the React frontend uses to determine the API endpoint and API key necessary to make calls to the Health Check tracking API.
+
+    - REACT_APP_API_URL - The endpoint URL of the Health Check tracking API
+    - REACT_APP_API_KEY - The API key for accessing the Health Check tracking API
+

Humongous.Healthcare/README.md

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+# Humongous.Healthcare API Service
+
+This codebase is a representative example of a Health Check tracking API service for Humongous Healthcare.
+
+# Running the API Service
+
+To run the API service locally, it is necessary to define the `CosmosDb::Account` and `CosmosDb::Key` settings in the `appsettings.json` file to point to a valid CosmosDb account.
+
+```json
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft": "Warning",
+      "Microsoft.Hosting.Lifetime": "Information"
+    }
+  },
+  "AllowedHosts": "*",
+  "CosmosDb": {
+    "Account": "<Replace with your account URL>",   // <-- The CosmosDb Account
+    "Key": "<Replace with your account key>",       // <-- The CosmosDb Access Key
+    "DatabaseName": "HealthCheckDB",
+    "ContainerName": "HealthCheck"
+  }
+}
+```