Add suppliers notes app

notes/README.md

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+# S4 Extension with CAP
+
+## Scenario
+
+This sample applications shows how to extend an existing oData service on BTP using CAP.
+
+In our scenario, we want to extend the entity `A_BusinessPartner` of an external service ([BusinessPartner API](https://api.sap.com/api/API_BUSINESS_PARTNER/resource)) with a `note` field so that our end-users of the applictions can maintain notes for each business partner
+## Diagramm
+
+![](assets/NotesService.png)
+
+## Usage
+
+### Business Partner Local Mock
+
+Start a CAP process for the local mock server for Business Partner and a second one for the CustomerService:
+
+1. Run: `cds mock API_BUSINESS_PARTNER -p 5001`
+2. Wait until startup is completed
+3. Run in a 2nd terminal: `cds serve all --with-mocks --in-memory`
+4. Now, you can issues the requests listed in `requests.http`
+
+### Business Partner from Sandbox Server
+
+1. Goto https://api.sap.com/api/API_BUSINESS_PARTNER/resource
+2. Get service key
+3. Export env var `S4_APIKEY` with the service key (`export S4_APIKEY="<your-service-key>"`)
+4. Run: `CDS_ENV=sandbox cds watch`
+5. Now, you can issues the requests listed in `requests.http`