eat: add $schema property with default value to the top of the ORD do…

…cument

lib/defaults.js

@@ -18,6 +18,7 @@ const nameWithSpaces = (name) => {
  * @module defaults
  */
 module.exports = {
+  $schema: "https://sap.github.io/open-resource-discovery/spec-v1/interfaces/Document.schema.json",
   openResourceDiscovery: "1.9",
   policyLevel: "none",
   description: "this is an application description",

lib/ord.js

@@ -175,7 +175,8 @@ module.exports = (csn) => {
         throw error;
     }
 
-    let oReturn = {openResourceDiscovery: "1.9",
+    let oReturn = { $schema: "https://sap.github.io/open-resource-discovery/spec-v1/interfaces/Document.schema.json",
+        openResourceDiscovery: "1.9",
         policyLevel: fGetPolicyLevel(global),
         description: fGetDescription(global),
         products: fGetProducts(global),

ord.md

@@ -40,9 +40,9 @@ The below is the table for all the supported ORD Fields containing defaults and
 
 Note: `namespace` is usually taken from `.cdsrc.json` if not we take the `package.json` name. 
 
-
 | ORD Field  | Type | Defaults | Preset/Annotation | Usage Example | Description |
 |----------|----------|----------|----------|----------|----------|
+| $schema        | string  | ```"https://sap.github.io/open-resource-discovery/spec-v1/interfaces/Document.schema.json"``` | Preset  | ```"$schema": "https://sap.github.io/open-resource-discovery/spec-v1/interfaces/Document.schema.json"``` | Optional URL to the Open Resource Discovery document schema (defined as a JSON Schema). |
 | openResourceDiscovery    | string  |-   | -  | -   | 1.9 (generated by plugin)  |
 | policyLevel    | string   | ```"none"```   | Preset   |```"policyLevel": "sap:core:v1"``` | The policy level (aka. compliance level) that this ORD Document or part of it needs to be compliant with.   |
 | description    | string   | ```"description": "this is an application description"```   | Preset   | ```"description": "this is a custom description"```  | The description of the ORD Document itself.   |