[VOL-1615] Create VOLTHA 2.0 Helm Charts

Squashed version of David Bainbridge's patches at commit:

 https://github.com/ciena/voltha-helm-charts/commit/120fb4b719e0492e6a0a24cc78d08b806e3698fa

Linted the README, fixed whitespace and incubator repo address

Change-Id: I7c5b1c3478450bbefbed09a75e9029e6371cae3a
diff --git a/.gitignore b/.gitignore
index 48f8698..5983ce0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,5 +4,8 @@
 # lockfiles for requirements.yaml for dependent charts
 requirements.lock
 
-# sub charts directoies, created by helm dep ...
+# sub charts directories, created by helm dep ...
 charts
+
+# misc files
+.*.swp