Add note in GettingStarted for Jest docs

Author: Damian Sznajder

docs/Introduction.GettingStarted.md

@@ -30,16 +30,16 @@ Homebrew is a package manager for macOS, we'll need it to install other command
 #### 2. Install [Node.js](https://nodejs.org/en/)
 
 Node is the JavaScript runtime Detox will run on. **Install Node 7.6.0 or above for native async-await support**
-	
+
  ```sh
- brew update && brew install node 
+ brew update && brew install node
  ```
 
 > TIP: Verify it works by typing in terminal `node -v` to output current node version, should be higher than 7.6.0
-	 
+
 #### 3. Install [appleSimUtils](https://github.com/wix/AppleSimulatorUtils)
-	 
-A collection of utils for Apple simulators, Detox uses it communicate with the simulator. 
+
+A collection of utils for Apple simulators, Detox uses it communicate with the simulator.
 
 ```sh
 brew tap wix/brew
@@ -71,16 +71,18 @@ npm install detox --save-dev
 
 #### 2. Install mocha
 
-You can use any JavaScript test runner, [Mocha](https://mochajs.org/) is a good one we recommend:
+You can use any JavaScript test runner
+- [Jest](Guide.Jest.md)
+- [Mocha](https://mochajs.org/) is a good one we recommend:
 
 ```sh
 npm install mocha --save-dev
-``` 
+```
 
 #### 3. Add Detox config to package.json
 
 The basic configuration for Detox should be in your `package.json` file under the `detox` property:
-	
+
 ```json
 "detox": {
   "configurations": {
@@ -90,10 +92,10 @@ The basic configuration for Detox should be in your `package.json` file under th
       "type": "ios.simulator",
       "name": "iPhone 7"
     }
-  } 
+  }
 }
 ```
-	
+
 In the above configuration example, change `example` to your actual project name. Under the key `"binaryPath"`, `example.app` should be `<your_project_name>.app`. Under the key `"build"`, `example.xcodeproj` should be `<your_project_name>.xcodeproj` and `-scheme example` should be `-scheme <your_project_name>`.
 
 For iOS apps in a workspace (eg: Cocoapods) use `-workspace ios/example.xcworkspace` instead of `-project`.
@@ -143,6 +145,6 @@ Use the Detox command line tools to test your project easily:
 detox test
 ```
 
-That's it. Your first failing Detox test is running! 
+That's it. Your first failing Detox test is running!
 
 Next, we'll go over usage and how to make this test [actually pass](Introduction.WritingFirstTest.md).