Add Development notes (#2195)

Author: cesnietor

DEVELOPMENT.md

@@ -0,0 +1,61 @@
+# Development
+
+## Deploy operator in K8s
+With a Kubernetes cluster (local you can use Kind) in `./` run:
+```
+kubectl apply -k resources/ 
+kubectl apply -k resources/base/
+```
+That will deploy an operator with a defined image.
+
+To access the UI get the operator token from:
+```
+kubectl describe secrets -n minio-operator console-sa-secret | grep 'token:' | awk '{print $2}' | pbcopy
+```
+
+Once the server is running you can see the UI either by port forwarding or using kubefwd for the operator pod.
+
+For development you can also run locally yarn in the web-app/ folder just make sure the port in `package.json` is the same as the operator console service.
+```
+"proxy": "http://localhost:9090/"
+```
+
+And in the web-app run:
+```
+yarn install
+yarn start
+```
+
+## Deploy operator in K8s with custom image using Kind:
+
+Build an image like:
+```
+make build TAG="minio/operator:<YOUR_TAG>" && kind load docker-image minio/operator:<YOUR_TAG>
+```
+
+And update the image from resources/base/ for `console-ui.yaml` and `deployment.yaml`
+```
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: console
+  template:
+    metadata:
+      labels:
+        app: console
+        app.kubernetes.io/instance: minio-operator-console
+        app.kubernetes.io/name: operator
+    spec:
+      containers:
+        - args:
+            - ui
+            - --certs-dir=/tmp/certs
+          image: minio/operator:cesnietor
+
+```
+
+Apply resources again to see this:
+```
+kubectl apply -k resources/base/
+```