Add Guides sand SigV4 support guide

_benchmark/guides/index.md

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+---
+layout: default
+title: Use cases
+nav_order: 70
+has_children: true
+---
+
+# OpenSearch Benchmark use cases
+
+The following section provides guides for specific use cases of OpenSearch Benchmark. To get started, select from the following guides:
+
+- [AWS Signature Version 4 (SigV4) Support]({{site.url}}{{site.baseurl}}/benchmark/guides/sigv4-support/)
+

_benchmark/guides/sigv4-support.md

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+---
+layout: default
+title: SigV4 Support
+nav_order: 70
+parent: Guides
+---
+
+# Running OpenSearch Benchmark with AWS Sigv4 
+
+OpenSearch Benchmark supports AWS Signature Version 4 (Sigv4) authentication. To run with Sigv4, use the following steps:
+
+1. Provision a serverless collection with proper access policies and security policies. Serverless usually requires that users specify an IAM User or Role ARN in the access policy.
+
+2. Set up environment variables where you are running OSB
+```
+OSB_AWS_ACCESS_KEY_ID=<<IAM USER AWS ACCESS KEY ID>
+OSB_AWS_SECRET_ACCESS_KEY=<IAM USER AWS SECRET ACCESS KEY>
+OSB_REGION=<YOUR REGION>
+OSB_SERVICE=aos
+```
+
+3. Invoke OSB like the command below. Ensure that you are specifying:
+
+- `--client-options=amazon_aws_log_in:environment`: Tells OpenSearch Benchmark when you've exported your environment's credentials.
+
+## Example
+
+The following example `execute-test` command run a benchmark test with sigv4 enabled:
+```
+opensearch-benchmark execute-test \
+--distribution-version=2.3.0 \
+--target-hosts=<YOUR COLLECTION ENDPOINT> \
+--pipeline=benchmark-only \
+--workload percolator \
+--client-options=timeout:120,amazon_aws_log_in:environment \
+--exclude-tasks=check-cluster-health,refresh-after-index,force-merge,refresh-after-force-merge,wait-until-merges-finish,percolator_with_content_ignore_me
+```