Added README

README.md

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+# cloudlog
+
+A small application to forward received messages.
+
+Right now, it will take in a [CloudEvent](https://github.com/cloudevents/spec) message from a [Tekton](https://github.com/tektoncd/pipeline) task and send Slack notifications.
+
+## Usage
+
+### Local usage for testing
+
+```
+$ slackURL='https://hooks.slack.com/services/T...' ./cloudlog
+```
+
+### Kubernetes deployment
+
+```
+# Create Slack Webhook secret
+kubectl create secret generic cloudlog-secret --from-literal slackURL='https://hooks.slack.com/services/T...'
+
+# Create the cloudlog service
+kubectl apply -f kubernetes/service.yml
+
+# Create the cloudlog deployment (build your own image?)
+kubectl apply -f kubernetes/deployment.yml
+
+# Check that the pod is running
+kubectl get pods  -l app=cloudlog
+
+# Follow the logs
+kubectl logs -f -l app=cloudlog
+```
+
+### Tekton usage
+
+Create a resource for the service
+
+```
+---
+apiVersion: tekton.dev/v1alpha1
+kind: PipelineResource
+metadata:
+  name: event-to-cloudlog
+spec:
+  type: cloudEvent
+  params:
+    - name: targetURI
+      value: http://cloudlog.default.svc.cluster.local:3000/inbox
+```
+
+Utilize the resource as the output for a task
+```
+---
+apiVersion: tekton.dev/v1alpha1
+kind: Task
+metadata:
+  name: send-a-message
+spec:
+  inputs:
+...
+  outputs:
+    resources:
+      - name: notification
+        type: cloudEvent
+```
+
+Provide TaskRun parameters for the resource
+```
+---
+apiVersion: tekton.dev/v1alpha1
+kind: TaskRun
+metadata:
+  generateName: send-message-
+  label: send-message
+spec:
+...
+  outputs:
+    resources:
+      - name: notification
+        resourceRef:
+          name: event-to-cloudlog
+```