chore: Update README.md to outline support for JSON and YAML CloudFormation templates

Author: 96malhar

Libraries/src/Amazon.Lambda.Annotations/README.md

@@ -87,7 +87,47 @@ The above two examples when used together will the use the value of LambdaRolePa
 To bridge the gap from Lambda Annotations programming model to the normal programming model a .NET source generator is included in this package.
 After adding the attributes to your .NET code the source generator will generate the translation code between the 2 programming models. It will also
 keep in sync the generated information including a new function handler string into the CloudFormation template. The usage of source
-generator is transparent to the user.
+generator is transparent to the user. The source generator supports syncing of both JSON and YAML CloudFormation templates.
+```csharp
+[LambdaFunction(Name = "Plus")]
+[RestApi(LambdaHttpMethod.Get, "/plus/{x}/{y}")]
+public int Plus(int x, int y)
+{
+    return x + y;
+}
+```
+The source generator adds the following entry in the CloudFormation template corresponding to the above Lambda function:
+```json
+"Plus": {
+      "Type": "AWS::Serverless::Function",
+      "Metadata": {
+        "Tool": "Amazon.Lambda.Annotations",
+        "SyncedEvents": [
+          "RootGet"
+        ]
+      },
+      "Properties": {
+        "Runtime": "dotnet6",
+        "CodeUri": ".",
+        "MemorySize": 256,
+        "Timeout": 30,
+        "Policies": [
+          "AWSLambdaBasicExecutionRole"
+        ],
+        "PackageType": "Zip",
+        "Handler": "TestServerlessApp::TestServerlessApp.Functions_Plus_Generated::Plus",
+        "Events": {
+          "RootGet": {
+            "Type": "Api",
+            "Properties": {
+              "Path": "/plus/{x}/{y}",
+              "Method": "GET"
+          }
+        }
+      }
+    }
+  }
+```
 
 To see the code that is generated by the source generator turn the verbosity to detailed when executing a build. From the command this 
 is done by using the `--verbosity` switch.