Add specification file and logo (#826)

public/v4/apps/node-exporter.yml

@@ -0,0 +1,33 @@
+captainVersion: 4
+services:
+    $$cap_appname:
+        image: prom/node-exporter:$$cap_version
+        restart: always
+        volumes:
+            - /var/run/docker.sock:/var/run/docker.sock:ro
+            - /sys:/host/sys:ro
+            - /proc:/host/proc:ro
+            - /:/rootfs:ro
+        logging:
+            driver: 'json-file'
+            options:
+                max-size: '10m'
+        caproverExtra:
+            notExposeAsWebApp: true
+caproverOneClickApp:
+    variables:
+        - id: $$cap_version
+          label: Node Exporter Version
+          defaultValue: 'v1.5.0'
+          description: Check out their docker page for the valid tags https://hub.docker.com/r/prom/node-exporter/tags
+          validRegex: /^([^\s^\/])+$/
+    instructions:
+        start: >-
+            Prometheus exporter for machine metrics, written in Go with pluggable metric collectors.
+        end: >-
+            Aaaand you're done! 😄
+            Your service is available at srv-captain--$$cap_appname:9100.
+    displayName: 'Node Exporter'
+    isOfficial: false
+    description: Prometheus exporter for machine metrics, written in Go with pluggable metric collectors.
+    documentation: Taken from https://github.com/prometheus/node_exporter and https://prometheus.io/docs/guides/node-exporter/