Besu-Private. Added README file

Author: vlasonfa

lib/besu-private/README.md

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+# Sample AWS Blockchain Node Runner app for Besu Private Network
+
+| Contributed by |
+|:--------------------:|
+| [@dmitridr](https://github.com/dmitridr), [@phuongnd11](https://github.com/phuongnd11), [@ishansohony](https://github.com/ishansohony), [@gap892003](https://github.com/gap892003), and others. |
+
+This blueprint deploys a ready-to-test private blockchain network powered by [Hyperledger Besu](https://github.com/hyperledger/besu/) with [IBFT consensus](https://arxiv.org/abs/2002.03613). It is accessible by applications via [AWS PrivateLink](https://aws.amazon.com/privatelink/) and [Network Load Balancer](https://docs.aws.amazon.com/elasticloadbalancing/latest/network/introduction.html) (NLB).
+
+High-level features include: 
+- Automated blockchain node recovery based on deep health check.
+- Automated key management after initial setup.
+- Deployment of software changes without downtime.
+
+### Accessing the blueprint
+
+:::info
+This blueprint is published in a different repository.
+:::
+
+Open here: **[Besu Private Chain on aws-samples](https://github.com/aws-samples/besu-private-chain/tree/main)**
+
+### Overview of Deployment Architecture
+
+![Besu Private Network Deployment](./doc/assets/BesuPrivateBlockchainArchitecture.png)
+
+The [AWS CDK stack](https://github.com/worldwide-asset-exchange/wax-aws-cdk) deploys the system that:
+
+1. Exposes the JSON-based Remote Procedure Call (RPC) API of 3-node Besu private network through NLB over AWS Private Link. (3 nodes is the minimum required for the functioning of IBFT consensus)
+2. Nodes run as Docker containers on [Amazon Elastic Container Service](https://aws.amazon.com/ecs/) (ECS) backed by [Amazon Elastic Compute Cloud](https://aws.amazon.com/ec2/) (EC2)and [Amazon Elastic Block Storage](https://aws.amazon.com/ebs/) (EBS) services with [Autoscaling Group](https://docs.aws.amazon.com/autoscaling/ec2/userguide/auto-scaling-groups.html) (ASG) for automatic recovery.
+3. Nodes store secret keys in [AWS Secrets Manager](https://docs.aws.amazon.com/secretsmanager/latest/userguide/intro.html) to protect them from deletion during recovery. [AWS Lambda](https://aws.amazon.com/lambda/) functions keep track of the mapping between running container nodes and their secrets in a [Amazon DynamoDB](https://aws.amazon.com/dynamodb/) table. They update the mapping if nodes are terminated and replaced by new containers.

lib/besu-private/doc/assets/BesuPrivateBlockchainArchitecture.png

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+---
+sidebar_label: Besu (Private)
+---
+#
+
+import Readme from '../../../lib/besu-private/README.md';
+
+<Readme />