Added Validation instructions to the readme (#839)

Author: grim

README.md

@@ -233,6 +233,22 @@ let branch: Branch = Branch.getInstance()
 
 ##### Testing
 
+##### Test your Branch Integration
+
+Test your Branch Integration by calling `validateSDKIntegration` in your AppDelegate. Check your Xcode logs to make sure all the SDK Integration tests pass. Make sure to comment out or remove `validateSDKIntegration` in your production build.
+
+```swift
+Branch.getInstance().validateSDKIntegration()
+```
+
+```objc
+[[Branch getInstance] validateSDKIntegration];
+```
+
+##### Test Deeplink routing for your Branch links
+
+Append `?bnc_validate=true` to any of your app's Branch links and click it on your mobile device (not the Simulator!) to start the test. For instance, to validate a link like: `"https://<yourapp\>.app.link/NdJ6nFzRbK"` click on: `"https://<yourapp\>.app.link/NdJ6nFzRbK?bnc_validate=true"`
+
 ###### Objective-C
 
 ```objc