feat(github): add documentation

Signed-off-by: Nicolas Lamirault <[email protected]>

README.md

@@ -0,0 +1,70 @@
+# Portefaix Grafana Dashboards
+
+## Description
+
+This repository contains some [Grafana](https://github.com/grafana/grafana) dashboards.
+
+You can also download them on [Grafana.com](https://grafana.com/grafana/dashboards/?plcmt=top-nav&cta=downloads&search=portefaix).
+
+## Dashboards
+
+| File name | Description | Screenshot |
+| :-------- | :---------- | :--------: |
+
+## Installation
+
+### Helm (Grafana or KubePrometheusStack)
+
+```yaml
+grafana:
+  dashboardProviders:
+    dashboardproviders.yaml:
+      apiVersion: 1
+      providers:
+        - name: "portefaix-grafana-dashboards"
+          orgId: 1
+          folder: "Portefaix"
+          type: file
+          disableDeletion: true
+          editable: true
+          options:
+            path: /var/lib/grafana/dashboards/portefaix-grafana-dashboards
+  dashboards:
+    portefaix-grafana-dashboards:
+      sre:
+        url: httpshttps://raw.githubusercontent.com/portefaix/portefaix-grafana-dashboards/dashboards/sre.json
+        token: ""
+```
+
+### Grafana Operator
+
+```yaml
+---
+apiVersion: grafana.integreatly.org/v1beta1
+kind: Grafana
+metadata:
+  name: grafana
+  labels:
+    grafana.com/dashboard: main
+spec:
+  config:
+    log:
+      mode: "console"
+    auth:
+      disable_login_form: "false"
+    security:
+      admin_user: root
+      admin_password: secret
+---
+apiVersion: grafana.integreatly.org/v1beta1
+kind: GrafanaDashboard
+metadata:
+  name: grafanadashboard-from-url
+  labels:
+    grafana.com/dashboard: main
+spec:
+  instanceSelector:
+    matchLabels:
+      grafana.com/dashboard: main
+  url: "https://raw.githubusercontent.com/portefaix/portefaix-grafana-dashboards/dashboards/sre.json"
+```