Add documenation to support helm3 migration

Signed-off-by: faizanahmad055 <faizan.ahmad55@outlook.com>

docs/Helm2-to-Helm3.md

@@ -0,0 +1,60 @@
+# Helm2 to Helm3 Migration
+
+Follow below mentioned instructions to migrate reloader from Helm2 to Helm3
+
+## Instrcutions:
+
+There are 3 steps involved in migrating the reloader from Helm2 to Helm3.
+
+### Step 1:
+Install the helm-2to3 plugin
+
+```bash
+helm3 plugin install https://github.com/helm/helm-2to3
+
+helm3 2to3 convert <release-name>
+
+helm3 2to3 cleanup --release-cleanup --skip-confirmation
+```
+
+### Step 2:
+Add the following Helm3 labels and annotations on reloader resources.
+Label:
+´´ýaml
+app.kubernetes.io/managed-by=Helm
+´´´
+Annotations:
+´´ýaml
+meta.helm.sh/release-name=<release-name>
+meta.helm.sh/release-namespace=<namespace>
+´´´
+
+For example, to label and annotate the ClusterRoleBinding and ClusterRole:
+
+```bash
+KIND=ClusterRoleBinding
+NAME=reloader-reloader-role-binding
+RELEASE=reloader
+NAMESPACE=kube-system
+kubectl annotate $KIND $NAME meta.helm.sh/release-name=$RELEASE
+kubectl annotate $KIND $NAME meta.helm.sh/release-namespace=$NAMESPACE
+kubectl label $KIND $NAME app.kubernetes.io/managed-by=Helm
+
+KIND=ClusterRole
+NAME=reloader-reloader-role
+RELEASE=reloader
+NAMESPACE=kube-system
+kubectl annotate $KIND $NAME meta.helm.sh/release-name=$RELEASE
+kubectl annotate $KIND $NAME meta.helm.sh/release-namespace=$NAMESPACE
+kubectl label $KIND $NAME app.kubernetes.io/managed-by=Helm
+```
+
+### Step 3:
+Upgrade to desired version
+```bash
+helm3 repo add stakater https://stakater.github.io/stakater-charts
+
+helm3 repo update
+
+helm3 upgrade <release-name> stakater/reloader --version=v0.0.72
+```