[stage-3] create atlantis helm chart

update readme

k8s/helm/atlantis/templates/ingress.yaml

@@ -0,0 +1,20 @@
+---
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: {{ .Chart.Name }}-{{ .Values.environment }}-ingress
+  annotations:
+    kubernetes.io/ingress.class: nginx
+    ingress.kubernetes.io/rewrite-target: /
+spec:
+  rules:
+    - host: atlantis-gw.my.to
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: {{ .Chart.Name }}-{{ .Values.environment }}
+                port:
+                  number: 4141