docs-fr | concepts | cluster-administration | logging.md (#15244)

* Add docs/concepts/cluster-administration/logging.md

* Add depending examples

* Translate first 2 chapters

* Coorect the path to debug/counter-pod.yaml

Only the english versions can be directly referenced.

* translate last chapter and adjust to doc style guide

* Fix french ortographic and gramatical errors

* Fix french grammar and orthograph

content/fr/examples/admin/logging/fluentd-sidecar-config.yaml

@@ -0,0 +1,25 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: fluentd-config
+data:
+  fluentd.conf: |
+    <source>
+      type tail
+      format none
+      path /var/log/1.log
+      pos_file /var/log/1.log.pos
+      tag count.format1
+    </source>
+
+    <source>
+      type tail
+      format none
+      path /var/log/2.log
+      pos_file /var/log/2.log.pos
+      tag count.format2
+    </source>
+
+    <match **>
+      type google_cloud
+    </match>