Adding README.md to clearly state that these charts belong to the 1.x branch of VOLTHA

Change-Id: Ifc3961a38be0eed4ac16990355b4b29b92d9b14c
diff --git a/voltha/Chart.yaml b/voltha/Chart.yaml
index 1237b00..b0246cc 100644
--- a/voltha/Chart.yaml
+++ b/voltha/Chart.yaml
@@ -16,5 +16,5 @@
 description: A Helm chart for Voltha based on K8S resources in Voltha project
 icon: https://guide.opencord.org/logos/cord.svg
 
-version: 1.0.8
+version: 1.0.9
 appVersion: 1.7.0