add limit quota information

Author: rpcme

README.md

@@ -76,6 +76,7 @@ and the result is sent to the bulk import SQS queue.
 
 # Prerequisites
 
+- [Identify any need to increase limit quotas](doc/aws-api-limits.md).
 - Amazon Web Services account. If you don't have an account, refer to https://docs.aws.amazon.com/iot/latest/developerguide/setting-up.html.  The relevant sections are **Sign up for an AWS account** and **Create a user and grant permissions**.  
 - Basic experience with Amazon CloudFormation 
 - Linux workstation or Amazon Linux EC2 instance with:

doc/aws-api-limits.md

@@ -0,0 +1,24 @@
+# AWS API Limits
+
+Thingpress invokes AWS APIs to import certificates and configurations.
+
+AWS protects customers by setting default limits to APIs. However, high performance operations (like those in Thingpress) may exceed the limits. The following is a list of APIs that may be impacted and to what value may require adjustment.
+
+- [AWS IoT Core endpoints and quotas](https://docs.aws.amazon.com/general/latest/gr/iot-core.html#throttling-limits)
+
+On the AWS IoT Core endpoints and quotas page, use the link in the **Adjustable** column to request an API limit increase.
+
+| API                          | Default Value (TPS) | Adjusted Value (TPS) <br/> (Default Parallelism)|
+| ---                          | ------------------- | -------------------- |
+| AttachPolicy                 | 15                  | **100** |
+| AttachThingPrincipal         | 100                 | n/a |
+| AttachThingToThingGroup      | 100                 | n/a |
+| CreateThing                  | 100                 | n/a |
+| DescribeCertificate          | 10                  | **100** |
+| DescribeThing                | 350                 | n/a |
+| DescribeThingGroup           | 100                 | n/a |
+| DescribeThingType            | 100                 | n/a |
+| GetPolicy                    | 10                  | n/a |
+| RegisterCertificateWithoutCA | 10                  | **100** |
+
+These limits were last checked on 6/13/2025. Please enter an issue if you identify a discrepancy.