Nitishm/docs/add sequence diagrams (#14)

* Add PUML sequence diagrams

Signed-off-by: Nitish Malhotra <nitish.malhotra@gmail.com>

* Setup azure-pipeline for Go

Signed-off-by: Nitish Malhotra <nitish.malhotra@gmail.com>

* Added sequence diagrams to docs

Signed-off-by: Nitish Malhotra <nitish.malhotra@gmail.com>

README.md

@@ -31,6 +31,10 @@ To solve the complex application orchestration problem Orkestra builds a [Direct
 6. Fetch and deploy Helm charts referred to by each `HelmRelease` CR to the Kubernetes cluster.
    (*optional) Embedded subcharts are fetched from the “staging” registry instead of the “primary/remote” registry.
 
+## Sequence Diagram
+
+See [sequence diagrams](./docs/SEQUENCE.md)
+
 ## Features
 
 - **Built for Kubernetes** - custom controller built using the [kubebuilder](https://github.com/kubernetes-sigs/kubebuilder) project

docs/SEQUENCE.md

@@ -0,0 +1,9 @@
+# Sequence Diagrams
+
+## Submitting an Application Group to a Kubernetes Cluster
+
+<p align="center"><img src="../assets/submit-sequence.png" width="750x" /></p>
+
+## Flow reversal on DAG node failure
+
+<p align="center"><img src="../assets/failure-sequence.png" width="750x" /></p>