Add deprecation notice to README (#83)

Author: humivo

README.md

@@ -23,12 +23,16 @@ Check out the links below for information on getting started with ADOT in Python
 
 
 
-### Applications for integration testing - Auto-instrumentation
+### Applications for integration testing - Auto-instrumentation (DEPRECATED)
+
+**WARNING:** This sample app is deprecated and is no longer maintained.  Please use the [new standardized sample apps](https://github.com/aws-observability/aws-otel-community/tree/master/sample-apps).
 
 See an app used for [integration testing with automatic instrumentation README.md](integration-test-apps/auto-instrumentation/flask/README.md) for setup instructions.
 
 
-### Applications for integration testing - Manual instrumentation
+### Applications for integration testing - Manual instrumentation (DEPRECATED)
+
+**WARNING:** This sample app is deprecated and is no longer maintained.  Please use the [new standardized sample apps](https://github.com/aws-observability/aws-otel-community/tree/master/sample-apps).
 
 See an app used for [integration testing with manual instrumentation README.md](integration-test-apps/manual-instrumentation/flask/README.md) for setup instructions.
 

integration-test-apps/auto-instrumentation/flask/README.md

@@ -1,4 +1,6 @@
-# AWS Distro for OpenTelemetry Python - Integration Testing App - Auto-instrumentation - Flask
+# AWS Distro for OpenTelemetry Python - Integration Testing App - Auto-instrumentation - Flask (DEPRECATED)
+
+**WARNING:** This sample app is deprecated and is no longer maintained.  Please use the [new standardized sample apps](https://github.com/aws-observability/aws-otel-community/tree/master/sample-apps).
 
 This application validates the continual integration of automatic instrumentation with the AWS Distro for OpenTelemetry Python and the AWS X-Ray back-end service. Validation is done using the [AWS Test Framework for OpenTelemetry](https://github.com/aws-observability/aws-otel-test-framework).
 

integration-test-apps/manual-instrumentation/flask/README.md

@@ -1,4 +1,6 @@
-# AWS Distro for OpenTelemetry Python - Integration Testing App - Manual instrumentation - Flask
+# AWS Distro for OpenTelemetry Python - Integration Testing App - Manual instrumentation - Flask (DEPRECATED)
+
+**WARNING:** This sample app is deprecated and is no longer maintained.  Please use the [new standardized sample apps](https://github.com/aws-observability/aws-otel-community/tree/master/sample-apps).
 
 This application validates the continual integration of manual instrumentation with the AWS Distro for OpenTelemetry Python and the AWS X-Ray back-end service. Validation is done using the [AWS Test Framework for OpenTelemetry](https://github.com/aws-observability/aws-otel-test-framework).
 

integration-test-apps/none-instrumentation/flask/README.md

@@ -1,4 +1,6 @@
-# AWS Distro for OpenTelemetry Python - Integration Testing App - None-instrumentation - Flask
+# AWS Distro for OpenTelemetry Python - Integration Testing App - None-instrumentation - Flask (DEPRECATED)
+
+**WARNING:** This sample app is deprecated and is no longer maintained.  Please use the [new standardized sample apps](https://github.com/aws-observability/aws-otel-community/tree/master/sample-apps).
 
 This application provides a baseline for performance testing. It has no instrumentation and so when compared against apps that do have instrumentation, it helps reveal the overhead that comes with instrumentation.