Update README.md

README.md

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-# Rocket.Chat.Kotlin.SDK
+# Rocket.Chat.Kotlin.SDK
+
+### Setup
+
+#### Prerequisites
+- Use **Java Development Kit 8** . (Don't Use JDK 9 or above that, `kapt` doesn't work with JDK 9+)
+
+  For more information, refer [This Link](https://github.com/android/android-ktx/issues/461#issuecomment-375936653)
+
+ - Preferable IDE : Intellij Idea
+
+ #### Steps 
+ - Fork the project and clone using `git clone https://github.com/YOUR_USERNAME/Rocket.Chat.Kotlin.SDK.git`. 
+ - Open IntelliJ Idea
+ - **Import Project** (DO NOT DIRECTLY OPEN PROJECT)
+ - Browse and select Rocket.Chat.Kotlin.Sdk
+ - Select `Create project from existing sources` and click `Next`
+ - A list of source files will be presented. `Mark All` source files and click `Next`
+ - A list of libraries found will be presented. `Mark All` libraries and click `Next`
+ - A list of modules will be presented. `Mark All` modules and click `Next`
+ - Select the `JDK Home Path`. If `JAVA_HOME` is set on the machine, it will be automatically picked. **Make sure the version being selected is JDK 8 and not JDK 9+**
+ - Click `Next` and `Finish`
+
+ You might be presented with this
+
+ ![import_gradle_project](https://user-images.githubusercontent.com/24780524/54627595-c4940f00-4a99-11e9-9525-9aab1e2c80c4.png)
+
+Do not worry ! Just click `Inport Gradle Project`
+ - Select `Create separate module per source set`
+ - Select `Use default gradle wrapper`
+ - Click `Ok` and let it build.
+
+ Now you are good to go :)