Syncthing (#166)

* added syncthing logo

* add syncthing json

* add sync port

* correct sync port

public/v2/apps/syncthing.json

@@ -0,0 +1,43 @@
+{
+   "captainVersion": "2",
+   "documentation": "https://hub.docker.com/r/syncthing/syncthing",
+   "displayName": "Syncthing",
+   "description": "Open Source Continuous File Synchronization.",
+   "dockerCompose": {
+      "services": {
+         "$$cap_appname": {
+            "containerHttpPort": "8384",
+            "ports": [
+               "$$cap_port_sync:22000"
+            ],
+            "image": "syncthing/syncthing:$$cap_version",
+            "restart": "always",
+            "volumes": [
+               "$$cap_appname-data:/var/syncthing"
+            ]
+         }
+      },
+      "version": "2",
+      "volumes": {
+         "$$cap_appname-data": {}
+      }
+   },
+   "instructions": {
+      "end": "Your instance of Syncthing is now starting up.",
+      "start": "Read more about Syncthing's goals: https://github.com/syncthing/syncthing#goals"
+   },
+   "variables": [
+      {
+         "label": "Syncthing Docker Version",
+         "defaultValue": "1.5.0",
+         "description": "It's highly recommended that you don't use the latest tag but instead the major version you need.",
+         "id": "$$cap_version"
+      },
+      {          
+         "label":"Sync Protocol Listening Port",
+         "description":"Port that Syncthing listens on for data synchronization (TCP).",
+         "defaultValue":"22000",
+         "id":"$$cap_port_sync"
+      }
+   ]
+}