Add snippet to import the flutter_test package (#16)

* Add snippet to import the flutter_test package

* Add importFT snippet to table on README.md

Author: arthurdenner

README.md

@@ -38,6 +38,7 @@ Awesome Flutter Snippets is a collection of commonly used Flutter classes and me
 | `debugP`   | Debug Print  | Prints a message to the console, which you can access using the flutter tool's `logs` command (flutter logs). |
 | `importM`    | Material Package | Import Material package.
 | `importC`    | Cupertino Package | Import Cupertino package.
+| `importFT`    | flutter_test Package | Import flutter_test package.
 | `mateapp`    | Material App | Create a new Material App.
 | `cupeapp`    | Cupertino Package | Create a New Cupertino App.
 | `tweenAnimationBuilder`    | Tween Animation Builder | Widget builder that animates a property of a Widget to a target value whenever the target value changes.

snippets/snippets.json

@@ -333,6 +333,11 @@
         "body": "import 'package:flutter/cupertino.dart';",
         "description": "Import Flutter Cupertino package"
     },
+    "flutter_test Package": {
+		"prefix": "importFT",
+		"body": "import 'package:flutter_test/flutter_test.dart';",
+		"description": "Import flutter_test package"
+	},
     "Material App": {
         "prefix": "mateapp",
         "description": "Create a MaterialApp",