Update README.md to add notices section (#118)

Wording approved by AWS Application Signals PMs. 

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Co-authored-by: Prashant Srivastava <[email protected]>

Author: thpierce

README.md

@@ -6,7 +6,13 @@ This project provide AWS Distro base on [OpenTelemetry Python Contrib](https://g
 preconfigured for use with AWS services. Please check out that project too to get a better
 understanding of the underlying internals.
 
-## Python Version Support
+## Notices
+
+### Performance
+
+Enabling ADOT auto-instrumentation on Python applications could lead to an increase in API latencies at upper percentiles (P90), and is more noticeable in high throughput APIs or at high trace sampling rates. For more information, please contact [email protected].
+
+### Python Version Support
 This project ensures compatibility with the following supported Python versions: 3.8, 3.9, 3.10, 3.11
 
 ## Code Style Check