add InfluxDB v1.8, Grafana 7.0 and Telegraf docker-compose sample

Signed-off-by: Ignacio Van Droogenbroeck <ignacio@vandroogenbroeck.net>

telegraf-influxdb-grafana/README.md

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+## Telegraf, InfluxDB and Grafana
+This example defines one of the basic setups for Observability practice. These include, Telegraf working as client and collection agent, InfluxDB as Dtabase Time Series and Grafana for visualization of data.
+
+
+Project structure:
+```
+.
+├── docker-compose.yaml
+└── README.md
+```
+
+[_docker-compose.yaml_](docker-compose.yaml)
+```
+services:
+  influxdb:
+    container_name: influxdb
+    image: influxdb:latest
+    volumes:
+      - ./influxdb:/var/lib/influxdb
+    ports:
+      - "8086:8086"
+
+  grafana:
+    container_name: grafana
+    image: grafana/grafana
+    volumes:
+      - "grafana:/var/lib/grafana"
+    ports:
+      - "3000:3000"
+
+  telegraf:
+    container_name: telegraf
+    image: telegraf:latest
+
+volumes:
+  influxdb:
+  grafana:```
+
+When deploying this setup docker-compose maps InfluxDB in the port 8086 and 3000 for Grafana. The Telegraf container enable to you to specify in a telegraf.conf file what systems you want to monitor. By default Telegraf going to connect to http://influxdb:8086 and start to report data about your server. 
+
+## Deploy with docker-compose
+
+```
+$ docker$ compose up -d
+Creating network "telegraf-influxdb-grafana_default" with the default driver
+Creating influxdb ... done
+Creating grafana  ... done
+Creating telegraf ... done
+```
+
+## Expected result
+
+Check containers are running and the port mapping:
+```
+$ docker ps
+CONTAINER ID        IMAGE               COMMAND                  CREATED              STATUS              PORTS                          NAMES
+0f33ea260aee        grafana/grafana     "/run.sh"                About a minute ago   Up 52 seconds       0.0.0.0:3000->3000/tcp         grafana
+09aa6d8b4dc5        telegraf:latest     "/entrypoint.sh tele…"   About a minute ago   Up 51 seconds       8092/udp, 8125/udp, 8094/tcp   telegraf
+0760db685a08        influxdb:latest     "/entrypoint.sh infl…"   About a minute ago   Up 51 seconds       0.0.0.0:8086->8086/tcp         influxdb
+
+```
+
+Navigate to `http://localhost:3000` in your web browser to access the installed Grafana. The default user and password is admin/admin
+
+![page](screenshot.png)
+
+Stop and remove the containers
+
+```
+$ docker-compose down
+```
+
+To delete all data, remove all named volumes by passing the `-v` arguments:
+```
+$ docker-compose down -v
+```

telegraf-influxdb-grafana/docker-compose.yml

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+version: "3.3"
+
+services:
+  influxdb:
+    container_name: influxdb
+    image: influxdb:latest
+    volumes:
+      - ./influxdb:/var/lib/influxdb
+    ports:
+      - "8086:8086"
+
+  grafana:
+    container_name: grafana
+    image: grafana/grafana
+    volumes:
+      - "grafana:/var/lib/grafana"
+    ports:
+      - "3000:3000"
+
+  telegraf:
+    container_name: telegraf
+    image: telegraf:latest
+
+volumes:
+  influxdb:
+  grafana: