docs: notes in README for common misunderstandings (#602)

Added a Please Note section to document common misunderstandings that often lead to incorrect issue filings

README.md

@@ -10,10 +10,17 @@
 
 kube-bench is a Go application that checks whether Kubernetes is deployed securely by running the checks documented in the [CIS Kubernetes Benchmark](https://www.cisecurity.org/benchmark/kubernetes/). 
 
-Note that it is impossible to inspect the master nodes of managed clusters, e.g. GKE, EKS and AKS, using kube-bench as one does not have access to such nodes, although it is still possible to use kube-bench to check worker node configuration in these environments.
-
 Tests are configured with YAML files, making this tool easy to update as test specifications evolve.
 
+### Please Note 
+
+1. kube-bench implements the [CIS Kubernetes Benchmark](https://www.cisecurity.org/benchmark/kubernetes/) as closely as possible. Please raise issues here if kube-bench is not correctly implementing the test as described in the Benchmark. To report issues in the Benchmark itself (for example, tests that you believe are inappropriate), please join the [CIS community](https://cisecurity.org). 
+
+1. There is not a one-to-one mapping between releases of Kubernetes and releases of the CIS benchmark. See [CIS Kubernetes Benchmark support](#cis-kubernetes-benchmark-support) to see which releases of Kubernetes are covered by different releases of the benchmark.
+
+1. It is impossible to inspect the master nodes of managed clusters, e.g. GKE, EKS and AKS, using kube-bench as one does not have access to such nodes, although it is still possible to use kube-bench to check worker node configuration in these environments.
+
+
 ![Kubernetes Bench for Security](https://raw.githubusercontent.com/aquasecurity/kube-bench/master/images/output.png "Kubernetes Bench for Security")
 
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