Add package-lock.json, fix readme

.npmrc

@@ -0,0 +1 @@
+@sap:registry=https://npm.sap.com

README.md

@@ -11,7 +11,7 @@ In SAP Business Application Studio, open a terminal.
 Then clone the repo with this specific branch:
 
 ```sh
-git clone https://github.com/sap-samples/cloud-cap-samples -b OpenSAP-week2-unit3
+git clone https://github.com/sap-samples/cloud-cap-samples -b openSAP-week2-unit3
 cd cloud-cap-samples
 ```
 

package.json

@@ -11,8 +11,8 @@
     "bookshop": "cds watch packages/bookshop"
   },
   "dependencies": {
-    "@sap/cds": "latest",
-    "express": "*"
+    "@sap/cds": "^3",
+    "express": "^4"
   },
   "devDependencies": {
     "sqlite3": "*"

packages/bookshop/package.json

@@ -4,8 +4,8 @@
   "description": "A simple bookshop application, build in a self-contained all-in-one fashion, i.e. w/o reusing other packages.",
   "license": "SAP SAMPLE CODE LICENSE",
   "dependencies": {
-    "@sap/cds": "latest",
-    "express": "*"
+    "@sap/cds": "^3",
+    "express": "^4"
   },
   "scripts": {
     "start": "cds run --in-memory?",