Added Azure App Configuration event data schema. (#5309)

* Added Azure App Configuration event data schema.

* Added a few missing pieces.

* Prefixed event names with our service prefix 'AppConfiguration'.
* Added Microsoft.AppConfiguration to the event grid data-plane readme.

* Updated api-version path to '2018-01-01' from '2018-02-01'.

specification/eventgrid/data-plane/Microsoft.AppConfiguration/stable/2018-01-01/AppConfiguration.json

@@ -0,0 +1,47 @@
+{
+    "swagger": "2.0",
+    "info": {
+        "version": "2018-01-01",
+        "title": "Schema of Azure App Configuration events published to Azure Event Grid",
+        "description": "Describes the schema of the Azure App Configuration events published to Azure Event Grid. This corresponds to the Data property of an EventGridEvent."
+    },
+    "paths": {},
+    "definitions": {
+        "AppConfigurationKeyValueModifiedEventData": {
+            "description": "Schema of the Data property of an EventGridEvent for an Microsoft.AppConfiguration.KeyValueModified event.",
+            "type": "object",
+            "properties": {
+                "key": {
+                    "description": "The key used to identify the key-value that was modified.",
+                    "type": "string"
+                },
+                "label": {
+                    "description": "The label, if any, used to identify the key-value that was modified.",
+                    "type": "string"
+                },
+                "etag": {
+                    "description": "The etag representing the new state of the key-value.",
+                    "type": "string"
+                }
+            }
+        },
+        "AppConfigurationKeyValueDeletedEventData": {
+            "description": "Schema of the Data property of an EventGridEvent for an Microsoft.AppConfiguration.KeyValueDeleted event.",
+            "type": "object",
+            "properties": {
+                "key": {
+                    "description": "The key used to identify the key-value that was deleted.",
+                    "type": "string"
+                },
+                "label": {
+                    "description": "The label, if any, used to identify the key-value that was deleted.",
+                    "type": "string"
+                },
+                "etag": {
+                    "description": "The etag representing the key-value that was deleted.",
+                    "type": "string"
+                }
+            }
+        }
+    }
+}

specification/eventgrid/data-plane/readme.md

@@ -53,6 +53,7 @@ input-file:
 - Microsoft.ServiceBus/stable/2018-01-01/ServiceBus.json
 - Microsoft.Media/stable/2018-01-01/MediaServices.json
 - Microsoft.Maps/stable/2018-01-01/Maps.json
+- Microsoft.AppConfiguration/stable/2018-01-01/AppConfiguration.json
 ```
 
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