Update README.md

README.md

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 # Xcode10-Demo
 
-This is demo repository to explore Xcode 10 feartures. 
+At WWDC2018, Apple announced Xcode 10 with some great new features, this is a repository to demonstrate some of the features. 
+
+This repository linked to the blog post explaining all features in details. Read 
+https://medium.com/xcblog/wwdc18-xcode-10-in-action-f56e14c62d79
+
+##USAGE
+
+##### Paralllel Testing 
+
+Once we have Xcode 10 installed. Clone this repo and execute XCUITest in parallel. 
+
+  $ git clone https://github.com/Shashikant86/Xcode10-Demo
+  $ cd Xcode10-Demo
+  $ xcodebuild -project Xcode10-Demo.xcodeproj/ -scheme Xcode10-Demo -destination 'platform=iOS Simulator,OS=12.0,name=iPhone X' clean build test CODE_SIGN_IDENTITY="" CODE_SIGNING_REQUIRED=NO -parallel-testing-worker-count 2
+
+
+Now tests will run in 2 different simulator clones 
+
+
+### ISSUE
+
+There is issue when tests run in 4 or more simulators. One of the test fails wit early exit error. To reproduce run this 
+
+  $ xcodebuild -project Xcode10-Demo.xcodeproj/ -scheme Xcode10-Demo -destination 'platform=iOS Simulator,OS=12.0,name=iPhone X' clean build test CODE_SIGN_IDENTITY="" CODE_SIGNING_REQUIRED=NO -parallel-testing-worker-count 8