Adding README and cdevents-visulaiser project under poc

poc/README.md

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+# CDEvents Visualisation Reference Implementation
+
+The CDEvents Proof of Concept is demonstrated by CDEvents contributors to show the interactions between different CI/CD tools Tekton, Keptn and Spinnaker. In the PoC Tekton executes the Pipeline to build the artifact, Keptn handles the business decision and Spinnaker running the Pipeline to deploy the artifact. More information about the PoC can be found on the [PoC GitHub page](https://github.com/cdfoundation/sig-events/tree/main/poc).
+
+CDEvents Visualisation reference implementation helps to visualise the end-end workflow of the CDEvents Proof of Concept with different types of visualisations.
+
+### CDEvents aware tool
+CDEvents aware tool knows what exactly is CDEvent and it creates sequences and aggregation graph of the events produced by PoC.
+
+
+## Generic tool (Prometheus/Grafana)
+Generic tool like Prometheus/Grafana can consume a specific event format which is translated from CDEvents to show the tracking and monitoring of an end-end workflow of CDEvents PoC.
+
+## Visualisation Reference Architecture
+
+
+![Reference Architecture](visualisation_reference_architecture.jpg "Reference Architecture")

poc/cdevents-visualiser/.gitignore

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+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/

poc/cdevents-visualiser/.mvn/wrapper/maven-wrapper.properties

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+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.8.7/apache-maven-3.8.7-bin.zip
+wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.1/maven-wrapper-3.1.1.jar

poc/cdevents-visualiser/deploy_visualiser.sh

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+#!/bin/sh
+
+./mvnw spring-boot:build-image
+docker tag visualiser:0.0.1-SNAPSHOT localhost:5000/cdevents/visualiser
+docker push localhost:5000/cdevents/visualiser:latest
+
+kubectl delete -f visualiser-deployment.yaml
+kubectl apply -f visualiser-deployment.yaml
+
+kubectl delete trigger cdevents-visualiser-receiver || true
+
+kubectl create -f - <<EOF || true
+apiVersion: eventing.knative.dev/v1
+kind: Trigger
+metadata:
+  name: cdevents-visualiser-receiver
+  annotations:
+    knative-eventing-injection: enabled
+spec:
+  broker: events-broker
+  subscriber:
+    uri: http://cdevents-visualiser-service.default:8099/cdevents/visualiser
+EOF