Added corvid-app description

charts/corvid-app/DESCRIPTION.md

@@ -0,0 +1,54 @@
+This chart acts as an application abstraction layer so that the corvid library can be dropped in and used, even without the boilerplate templates!
+
+You can use this chart to create an arbitrary number of applications even in one helm chart by clever exploitation of helm aliases.
+
+Consider the following `Chart.yaml` dependencies section
+
+```yaml
+dependencies:
+- alias: api
+  condition: api.enabled
+  name: corvid-app
+  version: 0.2.7 # change to be latest corvid-app version
+  repository: "https://gitlab.com/api/v4/projects/55284972/packages/helm/stable"
+- alias: web
+  condition: web.enabled
+  name: corvid-app
+  version: 0.2.7 # change to be latest corvid-app version
+  repository: "https://gitlab.com/api/v4/projects/55284972/packages/helm/stable"
+```
+
+Using the alias function we can rename corvid-app to suit whatever app name we want it to become.
+We can then override settings in values.yaml using the aliases name:
+
+```yaml
+api:
+	image:
+	  registry: registry.example.org
+	  repository: foo/someapi
+	  tag: ""
+	deployment:
+		enabled: true
+	cron:
+		enabled: false
+	job:
+		enabled: false
+	daemonset:
+		enabled: false
+web:
+	image:
+	  registry: registry.example.org
+	  repository: foo/somefrontend
+	  tag: ""
+	deployment:
+		enabled: true
+	cron:
+		enabled: false
+	job:
+		enabled: false
+	daemonset:
+		enabled: false
+```
+
+Now we have a chart with no templates, creating very different applications with only `values.yaml` and `Chart.yaml`. This can be a very quick way to prototype a new application.
+Thus this can expedite the development process, as long as all you need fits in the confines of what is configurable in a corvid-app. Otherwise you will still prefer to use corvid directly for the possibility to override functionality to any desired level. You may find you start with a corvid-app, but then as your needs expand and you can warrant more time investment you will likely progress to creating your own corvid-app implementation for your specific needs using the corvid library directly just as the corvid-app does.