Modifies cloudevent task according to the new reorg proposal

Changes include:
  - adds version label
  - adds a minimum pipeline versions supported by the task
  - adds tags for task
  - modified description to add a summary

This patch moves the cloudevent files to the task directory and
renames the yaml file
  - The yaml filename is changed to match the resource name

Issue: #386

Signed-off-by: Shiv Verma <shverma@redhat.com>

task/cloudevent/0.1/cloudevent.yaml

@@ -3,7 +3,15 @@ apiVersion: tekton.dev/v1beta1
 kind: Task
 metadata:
   name: cloudevent
+  labels:
+    app.kubernetes.io/version: "0.1"
+  annotations:
+    tekton.dev/pipelines.minVersion: "0.12.1"
+    tekton.dev/tags: cloud
 spec:
+  description: >-
+    This Task send a single CloudEvent to a specified sink.
+
   params:
   - name: sink
     type: string