add setup task

Author: pelikhan

README.md

@@ -3,7 +3,7 @@
 This project contains a prototype development gateway implementation
 for the built-in DeviceScript cloud integration.
 
--  [Read the documentation](https://microsoft.github.io/devicescript/developer/gateway)
+-   [Read the documentation](https://microsoft.github.io/devicescript/developer/gateway)
 
 | :exclamation: This implementation is for prototyping only and not meant for production. |
 | --------------------------------------------------------------------------------------- |

package.json

@@ -26,6 +26,7 @@
         }
     },
     "scripts": {
+        "setup": "git submodule update --init --recursive && git pull && yarn install --frozen-lockfile",
         "build": "nx run-many --target=build"
     }
 }