Conformance results for v1.18/nexastack (cncf#1331)

* Conformance results for v1.18/nexastack

* Uploaded Participation form for v1.18/nexastack conformance

* Updated logo url for v1.18/nexastack conformance

v1.18/nexastack/PRODUCT.yaml

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+vendor: Xenonstack Inc
+name: Nexastack Managed Kubernetes
+version: v1.0.0
+website_url: https://www.nexastack.com
+documentation_url: https://www.nexastack.com
+product_logo_url: https://drive.google.com/file/d/1lrczU4HFXJS2JqLc3TMnmF9H8UpRm-R-/view?usp=sharing
+type: hosted platform
+description: Nexastack is a  Platform for the Automation of Cloud Native and IaC Tools for Effective
+Infrastructure Management

v1.18/nexastack/README.md

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+# How to reproduce
+
+## 1. Create your account on Nexastack platform
+
+Open [Nexastack](https://www.nexastack.com) and apply for invite. <em>(Currently we are supporting registrations via invitation only)</em>. Once received the invite, continue the onboarding process via following the instructions alongwith invite.
+
+Nexastack is Infrastructure as Code Platform allowing to install applications on a managed kubernetes. With Nexastack you manage applications and we manage kubernetes and the underlying Infrastructre.
+
+
+## 2. Create a new cluster and download kubeconfig
+On the main Navigation Panel go to your Project, choose Clusters, select Nexastack managed clusters. Here you will find the cluster managed by Nexastack for you.
+
+Request t kubeconfig using the cluster's action button.
+
+
+## 3. Access the cluster
+To access the cluster export kubeconfig file from step 4, for example:
+```
+export KUBECONFIG=~/cncf/kubeconfig
+```
+Now you're authorized to interact with your cluster:
+```
+kubectl get pods --all-namespaces
+```
+
+## 4. Run the tests
+Download a [binary release](https://github.com/heptio/sonobuoy/releases) of the CLI, or build it yourself by running:
+
+```
+$ go get -u -v github.com/heptio/sonobuoy
+```
+
+Deploy a Sonobuoy pod to your cluster and instruct it to ignore master taints:
+
+```
+$ sonobuoy run --plugin-env=e2e.E2E_EXTRA_ARGS="--non-blocking-taints=CriticalAddonsOnly,dedicated" --mode=certified-conformance
+```
+
+View actively running pods:
+
+```
+$ sonobuoy status
+```
+
+To inspect the logs:
+
+```
+$ sonobuoy logs
+```
+
+Once `sonobuoy status` shows the run as `completed`, copy the output directory from the main Sonobuoy pod to
+a local directory:
+
+```
+$ sonobuoy retrieve .
+```
+
+This copies a single `.tar.gz` snapshot from the Sonobuoy pod into your local `.` directory. Extract the contents into `./results` with:
+
+```
+mkdir ./results; tar xzf *.tar.gz -C ./results
+```
+
+To clean up Kubernetes objects created by Sonobuoy, run:
+
+```
+sonobuoy delete
+```