Add example to reuse open tab in Chrom (#120)

Adding the `.applescript` file on the _User_ project
and calling it using `listening` event as `reuse-chrome-tab.config.js`
example show.

closes #117

docs/addons/openChrome.applescript

@@ -0,0 +1,83 @@
+(*
+Copyright (c) 2015-present, Facebook, Inc.
+
+This source code is licensed under the MIT license found in the
+LICENSE file in the root directory of this source tree.
+*)
+
+property targetTab: null
+property targetTabIndex: -1
+property targetWindow: null
+
+on run argv
+  set theURL to item 1 of argv
+
+  tell application "Chrome"
+
+    if (count every window) = 0 then
+      make new window
+    end if
+
+    -- 1: Looking for tab running debugger
+    -- then, Reload debugging tab if found
+    -- then return
+    set found to my lookupTabWithUrl(theURL)
+    if found then
+      set targetWindow's active tab index to targetTabIndex
+      tell targetTab to reload
+      tell targetWindow to activate
+      set index of targetWindow to 1
+      return
+    end if
+
+    -- 2: Looking for Empty tab
+    -- In case debugging tab was not found
+    -- We try to find an empty tab instead
+    set found to my lookupTabWithUrl("chrome://newtab/")
+    if found then
+      set targetWindow's active tab index to targetTabIndex
+      set URL of targetTab to theURL
+      tell targetWindow to activate
+      return
+    end if
+
+    -- 3: Create new tab
+    -- both debugging and empty tab were not found
+    -- make a new tab with url
+    tell window 1
+      activate
+      make new tab with properties {URL:theURL}
+    end tell
+  end tell
+end run
+
+-- Function:
+-- Lookup tab with given url
+-- if found, store tab, index, and window in properties
+-- (properties were declared on top of file)
+on lookupTabWithUrl(lookupUrl)
+  tell application "Chrome"
+    -- Find a tab with the given url
+    set found to false
+    set theTabIndex to -1
+    repeat with theWindow in every window
+      set theTabIndex to 0
+      repeat with theTab in every tab of theWindow
+        set theTabIndex to theTabIndex + 1
+        if (theTab's URL as string) contains lookupUrl then
+          -- assign tab, tab index, and window to properties
+          set targetTab to theTab
+          set targetTabIndex to theTabIndex
+          set targetWindow to theWindow
+          set found to true
+          exit repeat
+        end if
+      end repeat
+
+      if found then
+        exit repeat
+      end if
+    end repeat
+  end tell
+  return found
+end lookupTabWithUrl

docs/addons/reuse-chrome-tab.config.js

@@ -0,0 +1,32 @@
+'use strict';
+
+const execSync = require('child_process').execSync;
+const port = 8080;
+
+module.exports = {
+  entry: {
+    index: [path.resolve(__dirname, 'app.js')],
+  },
+  mode: 'development',
+  output: {
+    filename: 'output.js',
+  },
+};
+
+module.exports.serve = {
+  port,
+  on: {
+    listening: () => {
+      execSync('ps cax | grep "Google Chrome"');
+      execSync(
+        `osascript openChrome.applescript "${encodeURI(
+          `http://localhost:${port}`
+        )}"`,
+        {
+          cwd: __dirname,
+          stdio: 'ignore',
+        }
+      );
+    },
+  },
+};