Modifies kythe task according to the new reorg proposal

**NOTE: This only modifies the content of the yaml, changing
        the location of the file will be done in a different
        commit to make review easier

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

Issue: tektoncd#386

Signed-off-by: Shiv Verma <[email protected]>

kythe/kythe-go.yaml

@@ -2,7 +2,18 @@ apiVersion: tekton.dev/v1beta1
 kind: Task
 metadata:
   name: kythe-go
+  labels:
+    app.kubernetes.io/version: "0.1"
+  annotations:
+    tekton.dev/pipelines.minVersion: "0.12.1"
+    tags: annotations
+    displayName: "kythe go"
 spec:
+  description: >-
+    This task generates annotations for source code.
+
+    The kythe-go Task runs the Kythe Go extractor for the given package, placing the resulting kzips in the output workspace.
+
   workspaces:
     - name: output
       description: Output directory for kzip output files.