Feat: remade project launching to be possible via helm chart

The magic is done. To launch it:

• Install helm
• Enter the helm script: cd helm-chart/todo-app
• Package it: helm package .
• Run it: helm install my-todo-app todo-app-0.1.0.tgz
• View kubectl status: kubectl get po -A
• Stop it: helm uninstall my-todo-app && rm todo-app-0.1.0.tgz

Let me know if something doesn't work!

Closes #20 (closed)

helm-chart/todo-app/templates/tests/test-connection.yaml

+apiVersion: v1
+kind: Pod
+metadata:
+  name: "{{ include "todo-app.fullname" . }}-test-connection"
+  labels:
+    {{- include "todo-app.labels" . | nindent 4 }}
+  annotations:
+    "helm.sh/hook": test
+spec:
+  containers:
+    - name: wget
+      image: busybox
+      command: ['wget']
+      args: ['{{ include "todo-app.fullname" . }}:3000']
+  restartPolicy: Never
+