Add general authoring page

[changelog:added]

docs/authoring/index.md

@@ -0,0 +1,19 @@
+While the [Atomist Skills Catalog][catalog] provides large number of useful
+skills, many users will have the need to create their own custom skill from time
+to time.
+
+The simplest way to create your own skill is to use the [Docker Container Runner
+skill][container-run-skill]. The Docker Container Runner skills allows you to
+run any Docker image you want whenever activity occurs in GitHub, whenever there
+is activity in chat, on a regular schedule, and even in response to custom
+events you or your tools. For example, you can run a container skill that sends
+a chat message whenever an issue in Jira is opened or that rebuilds your Docker
+images whenever a new base image is pushed to Docker Hub. Enable the [Docker
+Container Runner skill][container-run-skill] for your team or see the
+[Container Skill documentation](container-skills.md) for more information.
+
+You can also create skills using your favorite programming language. More
+information on how to do that will be made available at a later time.
+
+[catalog]: https://go.atomist.com/catalog "Atomist Skills Catalog"
+[container-run-skill]: https://go.atomist.com/catalog/skills/atomist/container-run-skill "Docker Container Runner Skill"

mkdocs.yml

@@ -44,12 +44,13 @@ nav:
   - Integrations:
       - GitHub: integration/github.md
       - Slack: integration/slack.md
-      #    - Docker Registries:
-      #        - Docker Hub: integration/docker-hub.md
-      #        - Google Container Registry: integration/gcr.md
-      #    - Google Cloud Platform: integration/gcp.md
+      # - Docker Registries:
+      #     - Docker Hub: integration/docker-hub.md
+      #     - Google Container Registry: integration/gcr.md
+      # - Google Cloud Platform: integration/gcp.md
       - Kubernetes: integration/kubernetes.md
   - Authoring:
+      - Skill Authoring: authoring/index.md
       - Container Skills: authoring/container-skills.md
       - Skill Trigger Payloads: authoring/payloads.md
   # - Developing a Skill: skill/develop.md