added package-zip(linux) command

Author: amsokol

README.md

@@ -77,12 +77,18 @@ See [Cloud Functions Local Emulator](https://cloud.google.com/functions/docs/emu
 
 If you prefer command-line interface instead of Visual Studio Code than use the next commands to create zip archive for deployment.
 
-For Windows using PowerShell:
+For Windows using `PowerShell`:
 
 ```bash
 npm run package-zip(windows)
 ```
 
+For Linux/Unix using `zip` utility (you have to install it before):
+
+```bash
+npm run package-zip(linux)
+```
+
 It creates `helloWorld.zip` that includes `index.js`, `package.json`, `settings.json` files.
 `helloWorld.zip` is ready to be deployed to **Google Cloud Platform**.
 

package.json

@@ -5,7 +5,8 @@
   "main": "index.js",
   "scripts": {
     "deploy-local": "tsc && functions deploy helloWorld --trigger-http",
-    "package-zip(windows)": "powershell Compress-Archive -Force -LiteralPath index.js, package.json, settings.json -DestinationPath helloWorld.zip"
+    "package-zip(windows)": "powershell Compress-Archive -Force -LiteralPath index.js, package.json, settings.json -DestinationPath helloWorld.zip",
+    "package-zip(linux)": "zip helloWorld.zip index.js package.json settings.json"
   },
   "author": "Aleksandr Sokolovskii",
   "license": "Apache-2.0",